AI for Load Development

[Sgt_Mike]

Interesting ,,,
What was the recommended method, has been the method I've used in working up loads for a good bit. (0.3gr increments, 0.003" seating increments, usually best loads are around / within 1ish grs of listed max for the upper node, in my experience)

Although the components I used in the Remington PCR 700 (6.5 CM) was Winchester 6.5 StaBALL powder Barnes 145gr Match Burners, in SRP Starline Brass.

I asked grok using the components listed above just to see how close the response would be to my load.

Grok's response was start at 54.0grs, now a quick review of Hodgdon website shows the max for that powder to be 43.3grs with a 147gr bullet (2grs heavier bullet than my listed bullet). The real life node I found was 0.5gr wide, 42.0 to 42.5 grs.
The bullet seating was within 0.010" of what I had the bullet (I was longer).

Not quite sure why it showed 54.0 gr for a start, or where that came from. Heck I honestly don't think 54.0gr will fit in the case. The only thing I can think of was the manner in which I asked the question? I did list the model of the 700 which is Remington 700 PCR (Precision Chassis Rifle) which may have caused the fluke being so close to the 6.5 PRC round.
However it did list the specs exactly for the rifle in twist, length, barrel profile, including the 6.5 CM cartridge.

Just looked up the 6.5 PRC after typing the above, yeah 54.0grs of Winchester StaBALL HD would be a safe start load with a 147gr bullet. StaBALL HD is quite a bit slower than 6.5 StaBALL on the burn charts. The PRC case has more volume. Grok had to have given the StaBALL HD 6.5 PRC load data, even with identifying the correct caliber.

GIGO --- Garbage in Garbage out.

If it is that sensitive to input yeahhh maybe not for me.
Outside the suggested start load, like I said it did align with the methods I already employ so that is good in my opinion. Understand I'm not slamming Grok /AI just sharing the experience / observation with it. Had I just listed Remington 700 and the caliber then components, the response might have been more in alignment with reality.

 

[Animalaxe]

Yea, it’s not perfect and sometimes you have to clarify. “54 grains exceeds the max load in 6.5 CM. Are you using 6.5 PRC data?”. I have a long running thread about reloading with grok, so I usually start out with something like “do you remember my load development with the 6.5 CM Ruger American with the Banish 30?” If it comes back with more detailed data about my rifle and load I know we’re on the same page. If not, I feed it more details until we are. It’s a little bit of a learning curve getting the right questions asked, but I’ve been hand loading for a long time so, like you, I can tell when the data it spits back is a little wonky.

 

[Animalaxe]

Here’s another Q&A:

I have three pounds of Varget on the shelf and I want to use it to reload 6.5 CM, 6 CM and 22 Creedmoor. What bullet weights work best with varget in these calibers.

Answer:

Varget (Hodgdon) is an excellent extruded powder—temp-stable, consistent, and accurate in many short-action cartridges. It shines in medium-burn-rate applications but is on the faster side of the spectrum for these Creedmoor family cases. It delivers top-tier velocity and accuracy with lighter-to-midweight bullets, while heavier bullets often perform better with slower powders like H4350, RL-16/17, or StaBALL 6.5.


Always use current published load data from Hodgdon, Hornady, Sierra, or Lyman as your starting point. Begin 10% below maximum (or at the listed start charge), work up in 0.3–0.5 gr increments, and watch for pressure signs (flattened primers, sticky extraction, etc.). Factors like barrel length, twist rate, brass, primers, and OAL affect results. Your 3 lb jug is enough for extensive load development plus hundreds of rounds across all three calibers (typical charges run 33–42 gr).


Here are the bullet weights that work best with Varget in each caliber, based on manufacturer data (Hodgdon/Hornady/Sierra/Lyman) and real-world reports:


6.5 Creedmoor


Best: 115–130 grain bullets (sweet spot 120–130 gr).


Varget gives excellent accuracy and efficient velocities here (e.g., 123 gr Sierra MatchKing or 130 gr TMK/ELD-M at ~38–40 gr yields 2,850–2,960 fps with sub-MOA groups in many rifles). It’s commonly praised for 120–124 gr hunting/match bullets.


• Heavier 140–147 gr bullets are possible but suboptimal—Varget is a bit too fast, so you get lower velocities than with H4350.


• Lighter 85–107 gr varmint bullets also shoot well but aren’t the typical use case.
Examples from tested data: 123 gr SMK ~39.2 gr Varget for ~2,900+ fps; 130 gr loads in the high 2,700s fps.


6mm Creedmoor


Best: 85–108 grain bullets (particularly 95–105 gr).


Varget works nicely for mid-weight match and hunting bullets. Lyman data shows good charges for 105 gr Berger Hybrid (31.0–34.9 gr). Hornady lists it for lighter varmint bullets (58–75 gr V-MAX at up to ~42–44 gr). Some PRS shooters have used it successfully with 105–108 gr Hybrids (~36 gr).


• It’s not the optimal powder for 108–115+ gr heavies (slower powders like H4350 or RL-16 deliver higher velocity). Hodgdon’s online data center doesn’t always list Varget for the heaviest 6mm CM bullets, confirming it’s better suited to the lighter end.


22 Creedmoor (SAAMI-standardized)


Best: 60–75 grain bullets (especially 62–68–75 gr).


Hornady’s official data specifically lists Varget for these lighter, high-velocity loads:


• 62 gr ELD-VT: ~35.9–38.3 gr (3400–3600+ fps range).


• 68 gr BTHP: ~33.6–38.0 gr (3200–3700 fps range).
User reports confirm excellent results with 69 gr Sierra MK (~39 gr Varget for ~3,340 fps). Great for varminting or light match bullets.


• 80 gr+ (ELD-M/X) is possible but suboptimal—Varget runs too fast; Hornady and forums recommend slower powders (H4350, RL-26, etc.) for best velocity and pressure with heavier bullets. 85–90 gr is generally too heavy for Varget.


Quick tips for success with your Varget:


• Twist rate matters: 1:8” is ideal for stabilizing the weights above in all three calibers.


• Use a chronograph and work up carefully—Varget meters well but compression can vary.


• For maximum performance across all three, you’ll eventually want a slower powder for the heavier bullets, but Varget will get you plenty of accurate, fun-to-shoot loads right now.


If you tell me your barrel lengths, specific bullets/brass you own, or desired velocity goals, I can help narrow it further or point to exact starting charges from the manuals. Stay safe and enjoy the reloading!

 

[Sgt_Mike]

Yeah the way I posed the question was
"Most accurate load for Remington 700 PCR 6.5 Creedmoor, Winchester 6.5 StaBALL powder, Barnes 145 gr Match Burner, Starline SRP brass"

Which spit out the above listed 54 grs. Which honestly, I decided to refine the question at which point it wanted me to log-in create an account. Not desiring to do that I just let it lie right there.

 

[Animalaxe]

I took “PČR” out of your question and left everything else the same. Here’s what I got:
Is this close to your real world results?


The most accurate published and real-world load for your exact combo (Remington 700 6.5 Creedmoor, Winchester StaBALL 6.5 powder, Barnes 145 gr Match Burner, Starline SRP brass) is 42.7 grains of Winchester StaBALL 6.5 at a COAL of 2.825”.


This node has been documented in precision forums delivering .26 MOA groups at 200 yards (~2,685 fps, SD ~12 fps) in a 24” barrel—exactly matching most factory Remington 700 6.5 CM configurations. A nearby node at 43.2 gr also produced sub-0.5 MOA with excellent SD/ES. These come from direct user testing with the 145 gr Match Burner and StaBALL 6.5; no single “book” load is magically the most accurate because every rifle (throat, twist, barrel harmonics) is unique.


Official Barnes Load Data (your exact bullet)


Tested in 24” barrel, Hornady brass, standard primers, 2.825” COAL:


• Start: 39.2 gr StaBALL 6.5 → 2,439 fps


• Max: 44.1 gr StaBALL 6.5 → 2,762 fps


Barnes lists this as compressed at the top end. Your Starline SRP brass has a slightly different internal volume than Hornady (real-world reports show it can run 0.5–1 gr “hotter” pressure-wise because of the small primer pocket design), so treat 43.5–44.0 gr as your practical max and watch for pressure signs.


Recommended Load Development Protocol for Your Remington 700


1. Primer: Small Rifle (CCI 450, Federal 205M, or CCI #41 if you want military-spec). Starline SRP brass + StaBALL 6.5 likes a good small-rifle primer for consistent ignition.


2. COAL: Start at Barnes spec 2.825” (gives ~0.050–0.100” jump in most Rem 700 chambers). You can seat longer if your mag allows (up to 2.850–2.900” common in Rem 700) and do an OAL ladder once you find a velocity node.


3. Charge ladder (0.3 gr increments, 3–5 shot groups, chronograph mandatory):


• 40.0 gr (safe start)


• 40.3 → 40.6 → … → 43.0 gr (expected sweet spot)


• Stop at first signs of pressure (flattened primers, sticky extraction, ejector marks).


4. Expected results in a typical 24” Rem 700: 2,670–2,710 fps at the 42.5–43.0 gr node with single-digit SD/ES and sub-0.5 MOA.


Starline SRP note: The brass is excellent and very consistent, but because it’s thinner-walled / different volume than Hornady, start 0.5 gr lower than you would with standard LRP brass and watch closely near 43+ gr. Many users run identical charges to book data without issue once they verify with their rifle.


Safety & Final Reminders


• Always begin 10% below the listed start or at 39.0–40.0 gr.


• Work up in your rifle only—do not copy anyone else’s max load.


• Use a chronograph and watch for pressure. StaBALL 6.5 is temp-stable and meters like a dream, but it’s a ball powder—clean your barrel after each session.


• This load is for your specific components; Remington 700s love it because of the barrel harmonics around 42.5–43 gr with heavy match bullets.


If you tell me your barrel length, current COAL, primer brand, or what velocities you’re seeing, I can refine the ladder even tighter. Load safe, shoot straight, and enjoy that sub-MOA 6.5 CM!

 

[Sgt_Mike]

@Animalaxe Grok output = 43.0 gr (expected sweet spot)

Start at Barnes spec 2.825” (gives ~0.050–0.100” jump in most Rem 700 chambers). You can seat longer if your mag allows (up to 2.850–2.900” common in Rem 700) and do an OAL ladder once you find a velocity node.

Real world 42.0 to 42.5grs was the Node. So the actual load is dead between the two.... 42.2grs ( 0.8grs difference in my load and Grok suggest)
Bullet seating Real world 2.266 CBTO (COAL is 2.979").

So actually not far off at all to a actual load that was worked out prior to you posting this question. (the primers are win #41 5.56mm primers).

I didn't use a chronograph (yet) when I fired these, which all the 5 shot groups was within a 2% variance for five different groups at differing times, thus far 0.45 average .
-------sidebar--------------------------------------------
The other load that actually shot better than the Barnes was using the same powder (StaBALL 6.5) @ 44.7grs, Sierra 120gr SMK, (2.239" CBTO, 2.753" COAL) = 0.315 five shot group average again held with 2% for five differing times and groups.
-------------end of side bar back to topic------------------------
At the time I developed those two loads I didn't have a chronograph, but now I do so yeah at some point I'll chrono those two loads

 

[Sgt_Mike]

IIRC I started the Barnes 145gr loads at 40.4grs at 0.3 increments 1 round each. found the the widest node at 41.9 to 42.5. because most powder measures are within 0.1grs is why I say 42.0 to 42.5 .
In the pressure testing I went up to 43.7grs, still didn't have pressure signs. Having noticed the widest Node I settled the charge at that node and adjusted seating.

My jam or into lands length was 2.298" CBTO, I shot the pressure /ladder @ 2.288" CBTO, then adjusted CBTO using three shot groups went to 2.266 CBTO (0.032" Jump). AT which point I shot solely five shot groups to verify the charge and seating depth. (there was / is another node in the upper limit 43.4grs but is extremely narrow, so not useful)

Don't know if the above information help you in your choice to use / and or promote the AI concept.

While I'm not a initial fan, doesn't mean I won't be open minded and share honest data / results. From my point of view not Exactly spot on ... but it sure is close when one doesn't have a clue which way to go.

 

[hm1996]

Not reloading any longer and all my books and data are gone, but this is a very interesting thread. I wish I had kept the data from working up my load w/H450 (which was an obsolete powder) and an obsolete bullet (Nosler 100 gr. solid base SP) for my 243 WSSM when the 243 was a brand new cartridge. Hornady was the only book listing any data at all for that cartridge at the time. Can't help but wonder how ol Groc would compare to my results on that one.
Like Mike said, the recommended method of working up loads is almost identical to what I used for years. If I were still reloading, I would probably ask "Groc" when starting to work up a load just to see how close "his" predictions would be and work up the load as I have for many years (reference a number of different books, pick a starting load and work up in .2 to .5 gr increments depending on case size to find the node).

 

[Bob_Atl]

that's the key to AI, the detailed prompt, ie,
"the more I use it, the better I get at asking questions in a way that get me the info I’m looking for".

 

[Sgt_Mike]

I made the following comment:

From my point of view not Exactly spot on

Which I did not expound upon, It (Grok , AI that @Animalaxe is a fan of ) did narrow it down. But probably not to the actual desires of someone in their 20's and 30's would desire, which would be simply a easy button. In lieu of actually working the load. Which is why I said Not Exactly.. it in my opinion was really close
I was actually amazed at the results seeing how new the technology is.

I had figured it would need another 20 to 30 years. Maybe not???

I would probably ask "Groc" when starting to work up a load just to see how close "his" predictions would be and work up the load

Yeah Clarence pretty much what happened when Animalaxe and I sorta collaborated on this one. Basically told him the components etc,. he ran it. While I had already worked the load prior without telling him my results, until I posted them after his post.

And yeah I could have run the load hotter than the 43.7grs I stopped at, and went to say maybe 44.3grs (0.2grs over Barnes Data Max) and "might" have found a another node. But Barnes like many sources list Hornady large Rifle primered vs my Starline SR primed brass in their data. Figured best to find a reasonable wide node at the first time presented.

I don't know if not listing the action / maker would throw Grok's capabilities off or not. Just think about it there would not be much data for Grok to compile with :
1. Remington 721 in .244 Remington (6mm Remington) AI - Green Mountain barrel 1-7.5T
2. Remington 722 in 6mm Creedmoor - Bartein Barrel 5R 1-8T

Just don't think there would be much data points for Grok to do. IDK might prove me a fool to think such.

 

[Animalaxe]

Couple things…. Grok is just doing what we do as far as due diligence. Combing through bullet maker data, powder manufacturer data, forum posts, (he cites snipers hide, rokslide and this forum quite a bit but the citations don’t show up in the cut/paste). So it’s really just the compilation of a metric ton of data distilled down to your specific question. And he does it in seconds, not hours or days. When he extrapolates to fill the gaps in available data he shows the calculations and cites sources. And it’s not perfect. You’ll notice there’s always the disclaimer about blindly loading up someone else’s recipe without working up to it. So I agree 100% it’s not the “easy button” if you’re a brand new reloader. But I’ve been hand loading for 25 years so I have that to fall back on when things don’t add up. Then I reframe the question or offer more detail. It all results in getting me to a starting point that’s much closer to my goal when I fill in that first page in a range log for a new rifle. And that saves me time, components and trips to the range.

And it’s not just load development. Ask who has the best price on H4350 including hazmat and shipping right at this moment. Or what retailer offers mil/leo discounts. Or the trim to length for 300 RUM. Or what datum do you use to headspace a Creedmore case. Or the part number for your truck’s fuel filter. It’s just a better search engine is kinda how I look at it.

All that to say-it’s another tool in the box for me. If it helps any of you guys, so much the better.

 

[popper43]

Like AI knows everything about YOUR gun? Nope, not me.

 

[IndexFinger]

Like AI knows everything about YOUR gun? Nope, not me.

I think you wrong about that. AI is Brilliant Genius and knows Everything. I read it Posted on TikTok.. So I definitely know it's True .

insert internet Sarcasm Here ---> AI is the Future, the Past is Dead.
-

-

 

[Sgt_Mike]

Ok hashing this back up, why because I'm bored and sitting here trying to figure out what to load in the two 6mm (CM and Rem AI) with a bullet (Speer 70gr TNT) that is way less than optimum for the chamber Freebore that was used on both of the rifles as well as the twist. Like I said being bored let see what Google AI come up with for the 6mm Remington AI. As the AI is not a ballistic true tool rather searches the web for corresponding data in post and web site even here (this site) was cited as a reference and determining data points.

I warn you this post after this is long, and drawn out as I started as a factory 6mm Remington then threw curves integrating the Ackley chamber into the mix. Asked rpm maximum for the little thin jacket from speer, and as well as tried to make it to not compute. I even went into the dynamics of the barrel chambering dimensions.

 

[Sgt_Mike]

User input: 6mm remington speer 70 gr TnT CBTO jam length 2.472" Green mountain barrel 24" 1-7.5 twist cci-450 winchester staball match powder target velocity 3200 - 3300 fps suggested charge and bullet seating depth for neck tension and suppressor safety
AI Response:
To reach 3200–3300 fps with a 70 gr Speer TNT in a 6mm Remington, use a starting charge of 46.0 grains and a maximum of 49.0 grains of Winchester StaBALL Match. Set the bullet between 2.370" and 2.410" CBTO for proper neck tension and suppressor safety.

Because handloading involves inherent safety risks, always verify this data against an official source like the Hodgdon Reloading Center.
1. Bullet Seating Depth
Jam Length (Max): 2.472" Cartridge Base To Ogive (CBTO).
Target CBTO: 2.410" (0.062" jump).
Safe Suppressor CBTO: 2.370" (0.102" jump).
Why this matters: A shorter jump (0.010" off the lands) causes higher pressure spikes. When using a suppressor, this high pressure can stress the blast baffle. Jumping the bullet deeper softens the start of the pressure curve and ensures a tight, secure grip on the bullet by the case neck, preventing the bullet from jarring loose inside the magazine.
2. Powder Charge Data
Because StaBALL Match is a slow-burning ball powder, it fills the case well.
Starting Load: 46.0 grains (≈ 3150 fps)
Target Load: 47.5 grains (≈ 3250 fps)
Maximum Load: 49.0 grains (≈ 3350 fps)
3. Safety and Neck Tension Guidelines
Neck Tension: Size your brass to achieve at least 0.002" to 0.003" of neck tension (the difference between the inside diameter of the sized case neck and the bullet diameter of 0.243").
Suppressor Safety: A 70 grain Speer TNT is a thin-jacketed varmint bullet fired at extremely high speeds. In a fast 1-7.5 twist barrel, the bullet spins at roughly 300,000 RPM. Always check your target for evidence of bullet fragmentation or "puff balls" before attaching a suppressor to ensure the jackets aren't failing mid-flight.


If you are interested, I can provide:
The calculation for your bullet RPM to ensure it will not come apart in your barrel.
A guide on how to measure your exact CBTO if you want to verify your jam length.
Advice on how to check your neck tension with calipers.
Let me know how you would like to proceed!

User input: yes
Ai Response:
Here is the breakdown for your rotational math, measurement steps, and neck tension verification.
1. Bullet RPM Calculation
At your maximum target velocity of 3,300 fps in a fast 1-7.5" twist barrel, your bullet spins at 316,800 RPM.

The Risk: Thin-jacketed varmint bullets like the Speer TNT are structurally designed for standard 1-10" or 1-12" twist varmint rifles. Spinning them past 240,000 to 250,000 RPM can tear the jacket apart via centrifugal force right after leaving the muzzle.
Action Item: Shoot 5 rounds without your suppressor attached first. Look at the target at 50 yards. If you see grey puffs of smoke in the air or irregular, jagged holes on the paper, the bullet is failing. Do not attach your suppressor if this happens, as a fragmenting bullet will cause a destructive baffle strike.
2. Measuring Your Exact CBTO
To ensure your bullet is seated exactly where you want it relative to your 2.472" jam length, use a Hornady Lock-N-Load Bullet Comparator attached to digital calipers.
Step 1: Insert the correct 6mm/.243 insert into the comparator body.
Step 2: Zero your calipers with the comparator attached and closed completely against the opposite blade.
Step 3: Place your loaded round or dummy round into the caliper, ensuring the insert seats firmly on the bullet's ogive (the curved part, not the tip).
Step 4: Close the calipers and record the measurement. This is your true Cartridge Base To Ogive (CBTO) value. Subtract this number from your 2.472" jam length to know your exact jump distance.
3. Checking Neck Tension with Calipers
Proper neck tension prevents the bullet from moving under recoil or getting pushed into the case when cycling. You want between 0.002" and 0.003" of neck tension.
Step 1: Take a piece of fired brass that has been resized and decapped, but not yet charged or seated with a bullet.
Step 2: Use the inside-diameter jaws (the top small teeth) of your digital calipers to measure the inside of the case neck. Write this number down (e.g., 0.240").
Step 3: Take a bare 70 gr Speer TNT bullet and measure its outside diameter at its widest point. It should be exactly 0.243".
Step 4: Subtract the inside case neck diameter from the bullet diameter.

Alternative Method: Measure the outside neck diameter of a fully loaded round, then measure the outside neck diameter of a sized, unloaded case. The difference between the two numbers equals your interference fit (neck tension).
Which step would you like to troubleshoot or dive deeper into next?

 

[Sgt_Mike]

User input: change cartridge to 6mm Rem Ackley
AI Response:
Switching to the 6mm Remington Ackley Improved (6mm AI) significantly changes your case capacity, powder mechanics, and fireforming physics. Because the Ackley variant blows the shoulder out to 40 degrees and straightens the body taper, it adds roughly 11% more internal case volume.

A direct translation of your load profile and safety specs applies to the 6mm AI as follows.
1. Powder Charge Adjustments (Fireforming vs. Formed Brass)
Winchester StaBALL Match is a medium-slow ball powder that behaves perfectly in Ackley chambers. However, your target velocity of 3200–3300 fps is actually a mild-to-moderate load for a full-formed 6mm AI case with a 70 gr bullet (the 6mm AI can easily push 70 gr bullets past 3,600 fps).
If Fireforming (Shooting standard 6mm Rem brass in your 6mm AI chamber): Use the standard maximum 6mm Remington data to ensure clean, sharp shoulder forming. Set your charge to 48.0 to 49.0 grains of StaBALL Match.
If Reloading Formed 6mm AI Brass: The increased case volume lowers the initial pressure spike. To maintain your target 3200–3300 fps window, your starting charge jumps up. Use a starting load of 49.0 grains and a maximum safe ceiling of 52.5 grains.

2. Bullet Seating Depth & Headspace Physics
Your Jam Length (2.472" CBTO): This specific measurement changes when moving to a new chamber. When a barrel is re-chambered to an Ackley variant, the smith cuts the chamber 0.004" shorter at the neck-shoulder junction than a standard cartridge. This creates a intentional "crush fit" when you chamber standard brass so the case head is pinned flat against the bolt face during fireforming.
Recalculating Seating Depth: Because of this crush fit, you must remeasure your jam length using a modified 6mm AI case. Do not rely on the 2.472" measurement from your standard chamber.
Once Remeasured: Continue to maintain a safe suppressor clearance jump of 0.050" to 0.080" off your new jam length to protect your blast baffles from high start-pressures.

3. Bullet RPM Warning (Critical Shift)
Your 24" Green Mountain barrel with a fast 1-7.5" twist remains a major safety hazard with the ultra-light 70 gr Speer TNT bullet.
Because the 6mm AI chamber naturally increases velocity, if you accidentally push that 70 grain TNT to its potential top speeds (around 3,600 fps), your rotational math spikes dramatically:

At 345,600 RPM, a thin-jacketed varmint bullet like the TNT is highly likely to vaporize in mid-air immediately after exiting the muzzle. For a 1-7.5" twist barrel, it is highly recommended to steer toward tougher, thick-jacketed match or hunting projectiles (like the Barnes TSX or Hornady ELD Match) if you plan to harness the full velocity potential of the Ackley Improved case.
4. Neck Tension
Neck tension mechanics remain completely identical. You should still target 0.002" to 0.003" of interference fit using your digital caliper or micrometer measurement steps. Note that you will need a dedicated 6mm Remington Ackley Improved reloading die set to size formed brass, as standard 6mm Rem dies will ruin the 40-degree Ackley shoulder.




User input: CBTO is 2.472" with ackley chamber
AI Response: With your absolute jam length confirmed at 2.472" CBTO in your new 6mm Remington Ackley Improved chamber, you have a solid, fixed baseline.
1. Definitive Bullet Seating Depth Range
To ensure a secure neck grip for maximum neck tension and to prevent high initial pressure spikes that stress suppressor blast baffles, seat your bullet to a 0.060" to 0.080" jump.
For a 0.060" Jump: Set your seating die to 2.412" CBTO
For a 0.080" Jump: Set your seating die to 2.392" CBTO
Target Seating Window: 2.392" to 2.412" CBTO
Why this window protects your suppressor: Seating a 70 grain Speer TNT deeper gives the straight case neck full surface contact with the bullet's short bearing surface. This prevents the bullet from tilting or shifting under recoil inside your magazine. A centered bullet prevents yaw right out of the muzzle, lowering the risk of a destructive suppressor baffle strike.

Berger Bullets
2. Recalculated Powder Charges (Formed Brass)
Because you are loading fully reformed 6mm AI brass, the expanded 11% internal case volume means you must use more powder than a standard 6mm Rem case to hit your target velocity. However, you must cap your speed at 3,300 fps to keep your bullet from tearing its thin jacket apart at 316,800 RPM.

Accurate Shooter
Using Winchester StaBALL Match:
Starting Charge: 47.0 grains (Will yield roughly 3,100 fps. Use this to verify your baseline speed).
Target Charge: 48.5 grains (This should hit your sweet spot of 3,200 – 3,250 fps).
Maximum Safe Ceiling: 50.0 grains (Expect roughly 3,320 fps. Do not exceed this; spinning this specific bullet faster risks mid-air explosion).
3. Verification Protocol
Sizer adjustments: Ensure your 6mm Ackley Improved dies give you a solid 0.002" to 0.003" neck tension.
Dial your caliper-mounted Hornady Bullet Comparator to your target range (e.g., 2.400" CBTO) to confirm consistency.
Verify jacket stability by test firing at a paper target at 50 yards without the suppressor attached first. If the holes are perfectly round and no gray vapor trails are visible, it is completely safe to thread your suppressor on.


Accurate Shooter
recalculate seating depth for best neck tension
To achieve the maximum possible neck tension with the short bearing surface of the 70 grain Speer TNT bullet, seat your cartridge to 2.382" CBTO (a 0.090" jump from your 2.472" jam length).
This specific depth ensures the full length of your case neck grips the bullet securely while optimizing suppressor safety.
The Math: Why 2.382" CBTO is the Sweet Spot
The "One-Caliber" Rule: For maximum neck tension and bullet stability, the case neck should grip at least one bullet diameter’s worth of the straight bearing surface (0.243").
The Bullet's Physical Limitation: The 70 gr Speer TNT is a short, stubby varmint bullet. If you seat it out too far (closer to your 2.472" jam), only a tiny sliver of the bullet is held by the case neck. This results in weak neck tension, allowing the bullet to tilt (runout) or push deeply into the case under magazine recoil.
The Sweet Spot (2.382" CBTO): Seating to this depth places the entire straight section of the bullet's bearing surface completely inside the case neck without pushing the bullet's base below the neck-shoulder junction.
Benefits for Your Setup
Perfect Real-World Neck Tension: This seating depth maximizes your 0.002"–0.003" interference fit, keeping the bullet locked perfectly straight in the case neck.
Eliminates Bullet Runout: A bullet held securely over its entire bearing surface aligns perfectly with the center of the bore, drastically reducing flyer shots.
Maximum Suppressor Safety: Eliminating bullet tilt prevents the bullet from entering the barrel crooked. This guarantees the bullet exits the muzzle perfectly straight, removing the risk of a catastrophic suppressor baffle strike.
Lower Pressure Spikes: A 0.090" jump gives the slow-burning Winchester StaBALL Match powder a fraction of a millisecond to build volume before the bullet hits the rifling. This prevents high initial pressure spikes, saving your suppressor's blast baffle from unnecessary wear.
Action Plan
Use your digital calipers and a Hornady Bullet Comparator to adjust your seating die until your loaded dummy round reads exactly 2.382" CBTO.
Press down firmly on the bullet tip against your reloading bench with your thumb. If the bullet does not move, your neck tension is optimal.
Stick to your safe 6mm AI powder charge profile (47.0 to 48.5 grains) to stay under the 3,300 fps threshold and keep that bullet safely intact.
What would you like to verify next for this optimized load?

 

[Sgt_Mike]

User Input: recalculate powder charge at 39.2grs for velocity and accuracy potential using CBTO 2.382"
AI Response:
Firing a charge of 39.2 grains of Winchester StaBALL Match behind a 70 grain Speer TNT in a 6mm Remington Ackley Improved case will result in an under-loaded, potentially unsafe condition with very poor accuracy potential.
Always check your load data thresholds against official sources like the Hodgdon Reloading Center.
1. Velocity and Pressure Hazard (39.2 grains)
Estimated Velocity: ~2,450 to 2,550 fps (Far below your 3,200–3,300 fps target).
The Physics: Winchester StaBALL Match is a slow-burning, high-density ball powder. It requires specific pressure thresholds (usually above 45,000 PSI) to burn cleanly and consistently.
The Hazard: At 39.2 grains, the case fill will be roughly 65% to 70%. This leaves too much empty space in the large 6mm AI case. Ball powder left loosely in a case can result in erratic ignition, severe velocity spreads (over 100 fps variations), unburnt powder fouling your suppressor, or a dangerous hangfire/squib load.
2. Bullet RPM and Accuracy Impact
Rotational Speed: At 2,500 fps in your 1-7.5" twist barrel, the bullet will spin at 240,000 RPM.
Jacket Safety: The bullet will easily stay intact (no risk of mid-air explosion), which keeps your suppressor safe from fragments.
Accuracy Potential: Despite the bullet staying intact, your accuracy will likely be poor. Because ball powders burn incredibly erratically when under-loaded, your vertical stringing on targets will be severe due to large variations in muzzle velocity. Furthermore, your deep 2.382" CBTO seating depth maximizes neck tension, but it cannot overcome the erratic internal ballistics of an under-charged case.
3. Recommended Recalculation for Accuracy Potential
If you want to reduce your velocity to prioritize bullet jacket safety while maximizing your accuracy potential, you need to step up to the minimum functional threshold where StaBALL Match can burn cleanly.
The Minimum Safe Accuracy Floor: 45.0 grains
Estimated Velocity: ~3,000 fps (288,000 RPM)
Case Fill: Over 80%, providing consistent ignition and low velocity spreads.
Your Target Performance Node: 47.5 grains
Estimated Velocity: ~3,200 fps (307,200 RPM)
Why it works: This charge weight compresses beautifully with your optimal 2.382" CBTO seating depth, completely eliminating powder shifting, ensuring clean burns through your suppressor, and maximizing your long-range precision.
Verdict: Do not load at 39.2 grains with this powder. If you absolutely must shoot at 2,500 fps for a mild varmint load, you should switch entirely to a much faster-burning extruded powder like Hodgdon H4895 or IMR 4064.
How would you like to safely adjust this accuracy node?



re estimate potential at 46.0grs same CBTO, Same twist, same barrel, chambered 6mm AI
AI Response:
Firing 46.0 grains of Winchester StaBALL Match behind the 70 gr Speer TNT at 2.382" CBTO in your 24" 1-7.5" twist 6mm Ackley Improved barrel moves your load into a functional, safe, and highly accurate node.

This specific configuration provides balanced performance as detailed below. Always use an online data tool like the Hodgdon Reloading Center to cross-reference data.
1. Re-Estimated Velocity and Pressure
Estimated Muzzle Velocity: 3,000 to 3,075 fps.
The Physics: By stepping up to 46.0 grains, you fill roughly 78% to 82% of the 6mm AI case volume. This is enough loading density for ball powder to ignite uniformly, resulting in low velocity standard deviations (SDs) and eliminating the risk of a dangerous hangfire or squib load.

Why it misses your 3,200 fps target: Because the Ackley case is roughly 11% larger than a standard 6mm Rem case, 46.0 grains functions as a mild, low-pressure starting node in this chambering.

2. Bullet Structural Safety & Suppressor Security
Rotational Speed: At 3,050 fps, your 1-7.5" twist spins the bullet at 292,800 RPM.
Jacket Integrity: This RPM is right at the upper safety ceiling for the thin-jacketed Speer TNT. However, because you are keeping velocity near 3,000 fps rather than pushing past 3,300 fps, the risk of centrifugal jacket failure decreases significantly.
Suppressor Safety: Your deep 2.382" CBTO seating depth ensures the case neck has maximum bearing surface contact to grip the bullet perfectly straight. This clean alignment prevents bullet yaw out of the muzzle, making this load highly stable for shooting through your suppressor.
3. Accuracy Potential Profile
The Ignition Node: Because StaBALL Match mirrors the burn speed of powders like Varget, 46.0 grains acts as a reliable accuracy node.
Deep Seating Harmony: Seating the bullet 0.090" off your 2.472" jam length allows a clean pressure jump. The consistent neck tension from this deep seat will tighten your horizontal groups and reduce erratic velocity spreads.


Parameter
39.2 Grains (Previous) 46.0 Grains (Current Re-Estimate)
Velocity ~2,500 fps (Underloaded) 3,000 - 3,075 fps
Jacket Danger Zero risk Low-to-Moderate (Borderline ceiling)
Case Fill / SDs Poor (Erratic ignition) Good (Consistent burn)
Accuracy Match Poor vertical stringing High potential node
How to safely proceed: Test a 5-round group at 46.0 grains without your suppressor attached first. If you observe tight groups, perfectly round entry holes, and no gray smoke puffs mid-flight, your barrel is successfully stabilizing the TNT at this speed. You can then thread your suppressor on with confidence.
How would you like to handle testing for this specific 46.0gr load?

 

[Sgt_Mike]

User input: compare 46.0gr versus 47.5 gr for accuracy potential and suppessor safety
AI Response:
The 46.0-grain load provides significantly better suppressor safety, whereas the 47.5-grain load offers higher long-range accuracy potential at the cost of elevated structural risk to your bullet.
Always cross-reference your structural safety checks with official manufacturer maximums on the Hodgdon Reloading Center.
Side-by-Side Comparison
Parameter
46.0 Grains (Mild & Safe) 47.5 Grains (Performance Node)
Muzzle Velocity ~3,000 to 3,075 fps ~3,200 to 3,250 fps
Bullet Rotational Speed ~292,800 RPM ~312,000 RPM
Jacket Rupture Risk Low-to-Moderate (Safer margin) High (Approaching structural limit)
Case Fill & SD Stability ~80% volume (Clean, uniform ignition) ~85% volume (Excellent, optimal density)
Suppressor Safety Rating High Low-to-Moderate
Wind & Drop Performance Moderate High (Flatter trajectory)
Deep Dive: Accuracy Potential
The 46.0 gr Advantage: Your 2.382" CBTO seating depth ensures massive neck tension. This high mechanical grip helps the ball powder ignite consistently, keeping extreme velocity spreads low. This load serves as an excellent harmonic starting node.
The 47.5 gr Advantage: Winchester StaBALL Match is a progressive ball powder that burns more efficiently as chamber pressure climbs. At 47.5 grains, internal combustion is cleaner, case fill is tighter, and standard deviations (SDs) will shrink. The added velocity also minimizes wind drift and vertical drop at distance, increasing raw precision potential.
Deep Dive: Suppressor Safety
Why 46.0 gr Wins: The 70 grain Speer TNT is built with a thin jacket meant to fragment easily on varmints. In a fast 1-7.5" twist barrel, the extreme centrifugal force pulls the jacket outward. Keeping the speed near 3,000 fps (46.0 gr) keeps the RPM below 300,000. This lowers the chance of the jacket failing mid-flight and casting off metal shards that can destroy your suppressor baffles.
The Danger of 47.5 gr: Pushing the TNT past 3,200 fps drives the rotational forces up to 312,000 RPM. If the bullet jacket shears or bursts upon exiting the crown, it results in an immediate catastrophic baffle strike.
Loading Recommendations
If your goal is protecting the suppressor while maximizing precision, begin testing at 46.0 grains. Shoot a 5-round group at a paper target at 50 yards with the suppressor removed. If the entry holes are clean circles with no signs of tearing or gray trailing vapor, you can attach your suppressor. Only advance toward 47.5 grains if you closely verify jacket stability first.
Using a chronograph to track velocity is crucial when dealing with high RPM limits.
How would you like to set up your target testing protocol?




User input: probability in percentage of bullet failure with the 47.5 gr load
AI response:
Based on historical data for thin-jacketed varmint bullets fired through fast-twist barrels, the probability of bullet failure with your 47.5-grain load is 30% to 40%.
Because this configuration pushes a highly specialized bullet beyond its engineered structural limits, the risk of a mid-air explosion or jacket failure is high. Handloading carries inherent risks, so you should always prioritize safety and consult official data from the Hodgdon Reloading Center.
Why the Failure Probability is 30% to 40%
The RPM Structural Limit: Thin-jacketed varmint bullets (like the Speer TNT, Hornady V-MAX, or Sierra BlitzKing) are designed for standard 1-10" or 1-12" twist barrels, where they spin at roughly 180,000 to 220,000 RPM. Speer technically rates the TNT jacket up to roughly 240,000 to 250,000 RPM. Your 1-7.5" twist barrel spinning at 312,000 RPM exceeds that structural limit by over 20%.
The Barrel Friction Factor: Your Green Mountain barrel has an aggressive 1-7.5" rifling profile. To force a bullet to spin that fast in just 24 inches, the rifling lands must cut deeply into the soft copper jacket. These deep cuts act as stress risers (perforations). Combined with the extreme centrifugal force pulling outward, the jacket is highly prone to tearing along the rifling marks immediately upon exiting the muzzle.
The Suppressor Impact: The gas pressure cutting across the muzzle crown and entering the suppressor creates an additional layer of turbulence. If a jacket is already structurally compromised by the high RPM, this sudden pressure shift can trigger a complete jacket rupture inside the first few inches of your suppressor.
Real-World Scenarios (What the % Means)
Out of 10 rounds fired: You can expect 6 to 7 rounds to hold together and fly straight. However, 3 to 4 rounds will likely suffer either "puffed" jackets (producing a gray streak of copper smoke mid-air and wildly erratic accuracy) or total fragmentation (vaporizing into a cloud of fragments).
The Risk to Your Gear: Because a 30% to 40% failure rate means a bullet could come apart inside or just outside the muzzle, the probability of a catastrophic suppressor baffle strike is unacceptably high.
How to Reduce the Failure Probability to 0%
If you want to keep shooting at 3,200+ fps without risking your suppressor, you must switch to a bullet with a thicker, tougher jacket designed for fast-twist barrels:
Hornady 70 gr GMX / CX: Solid copper monolithic bullets that have no jacket to tear apart. (0% failure probability at 312,000 RPM).
Sierra 69 gr TMK or 70 gr MatchKing: Designed specifically for fast-twist match rifles with heavy target jackets that can easily withstand over 340,000 RPM.
Berger 70 gr Flat Base Target: Built with robust target jackets that easily handle high-velocity, high-RPM loads.
If you decide to proceed with testing the Speer TNT at 47.5 grains, you must remove your suppressor and shoot at a clean paper target at 25 or 50 yards first. Look for gray smoke or irregular, keyholed entry holes on the paper to confirm if your specific barrel is causing the bullets to fail.
How would you like to address this structural risk next?

 

[Sgt_Mike]

User Input: recalculate for 46.0gr load
AI Response:
With your powder charge set to 46.0 grains of Winchester StaBALL Match, the probability of bullet failure drops significantly to less than 5%.
This change moves your setup from a high-risk zone into a functional and stable configuration. Always verify your ballistic details with official data from the Hodgdon Reloading Center.
Why the Failure Probability Drops to <5%
Below the RPM Danger Threshold: At 46.0 grains, your muzzle velocity sits right around 3,000 to 3,050 fps. This keeps your rotational speed at ~292,800 RPM. While this is still fast for a thin-jacketed varmint bullet, it sits right on the edge of what the Speer TNT jacket can handle, minimizing the risk of a mid-air explosion.
Reduced Centrifugal Stress: Centrifugal force increases exponentially with velocity. Dropping your speed by 150–200 fps compared to the 47.5-grain load drastically reduces the outward tearing pressure on the copper jacket as it leaves your 1-7.5" twist Green Mountain barrel.
Lower Core Heat & Friction: A lower powder charge produces less gas pressure and heat. This means the rifling lands deform the jacket less, preserving its structural integrity.
Real-World Assessment for Your Suppressor
Safety Profile: At a <5% failure rate, 19 out of 20 bullets will fly perfectly straight. However, because you are using a suppressor, even a 5% risk means a bullet could shed a microscopic piece of its jacket or drift slightly offline, creating an unnecessary hazard for your baffles.
The Verdict: This load is safe to test, but you must use a specific verification protocol before attaching your suppressor.
Mandatory 3-Step Testing Protocol
To reduce your suppressor risk to absolute zero, follow these steps at the range:
Bare-Muzzle Test: Remove your suppressor completely.
Short-Range Target Check: Fire a 5-round group at a clean paper target placed at 25 or 50 yards.
Inspect the Target: Look closely at the holes.
Safe to suppress: The holes are perfectly crisp, round circles. This means the bullet is stable and holding together. You can safely thread your suppressor on.
Do NOT suppress: You see gray smudge marks radiating out from the holes, or the holes are slightly oval/elongated (keyholing). This indicates the jacket is starting to fail or slip on the rifling, and attaching a suppressor will likely cause a baffle strike.
Your optimized seating depth of 2.382" CBTO provides excellent neck tension and aligns the bullet straight in the bore, giving it the best possible start down the barrel.
What target feedback or ballistic metric would you like to plan for next?




User Input: recalculate with suppressor is Silencer Co Omega 300 30 caliber baffles
AI Response:
Using a SilencerCo Omega 300 with .30 caliber baffles drastically reduces your risk of a suppressor baffle strike, shifting your overall safety profile from high-risk to highly manageable.
While the physical probability of the bullet jacket failing remains exactly the same, the oversized bore provides a massive safety buffer.
1. The Clearance Math (.243 vs .308)
Bullet Diameter: 0.243"
Suppressor Baffle Aperture: ~0.360" to 0.375" (Standard for SilencerCo .30 cal baffles).
Total Radial Clearance: You have roughly 0.060" of extra space all the way around the bullet compared to using a dedicated 6mm silencer.
Why this matters: If a 70 gr Speer TNT bullet begins to yaw slightly or sheds microscopic flakes of its copper jacket due to the 292,800 RPM (at 46.0 grains) or 312,000 RPM (at 47.5 grains), the fragments and the destabilized bullet are highly likely to pass cleanly through the oversized .30 caliber holes without touching a single baffle.
2. Suppressor Safety Re-Evaluation
With the 46.0 gr Load (~3,050 fps / ~292,800 RPM): Your suppressor damage risk drops to near 0%. The bullet jacket is stable enough to stay intact, and the oversized .30 cal bore easily swallows any minor flight path deviations.
With the 47.5 gr Load (~3,250 fps / ~312,000 RPM): The probability of the bullet failing mid-air remains 30% to 40%. However, the probability of that failure causing a baffle strike drops significantly. If the bullet completely vaporizes inside the can, you will still coat your baffles in lead and copper debris, but a catastrophic structural strike to the main baffle stack is now a low-probability event.
3. Updated Seating Depth Strategy
Keep your seating depth at 2.382" CBTO.
Maximize neck tension to prevent bullet runout.
Keep the bullet straight down the massive .30 cal bore.
Minimize gas turbulence on the bullet base as it jumps into the oversized suppressor throat.
4. Operational Warning: The End Cap
The SilencerCo Omega 300 features user-replaceable front end caps.
Crucial Check: Ensure you are using the standard .30 caliber anchor brake or flat end cap.
The Hazard: If you swap the end cap out for a specialized aftermarket 6.5mm or 5.56mm cap to try and reduce noise, you will instantly eliminate your safety buffer. A failing TNT bullet will clip a tight-tolerance end cap.
How would you like to optimize your SilencerCo Omega 300 setup for this rifle?

 

[Sgt_Mike]

User Input: would H335 be a better choice?
AI Response:
No, Hodgdon H335 would be a significantly worse choice for your 6mm Remington Ackley Improved setup.
Switching to Hodgdon H335 would drastically lower your accuracy potential, increase the likelihood of bullet jacket failure, and raise the risk of fouling or damaging your SilencerCo Omega 300. Always verify powder burn rates and application data using tools like the Hodgdon Reloading Center.
1. Burn Rate and Pressure Dynamics
The Math: H335 is a fast-burning ball powder originally designed for smaller cases like the .223 Remington. The 6mm AI is a large-capacity case.
The Hazard: Because H335 burns so quickly, it will generate an incredibly sharp, violent pressure spike early in the ignition cycle. This massive pressure spike hits before the bullet can move forward down the barrel.
2. Increased Risk of Bullet Failure
Your 1-7.5" twist Green Mountain barrel is already straining the thin jacket of the 70 gr Speer TNT.
Jacket Shearing: The violent initial pressure spike from H335 will violently "smack" the base of the bullet. This forces the soft copper jacket to deform aggressively against the sharp, fast-twist rifling lands.
Result: This creates deep tears in the jacket before the bullet even leaves the barrel. Even if you throttle the velocity back, the mechanical stripping from a fast powder increases your bullet failure rate well beyond what you would experience with the smooth pressure curve of Winchester StaBALL Match.
3. Lower Case Fill and Poor Accuracy
Case Capacity: H335 is dense and fast. A safe charge weight would take up very little space in the large 6mm AI hull, leaving the case over 40% empty.
Erratic Ignition: When a ball powder has that much room to slide around inside a case, ignition becomes highly erratic depending on whether the powder is resting against the primer or the bullet. This causes massive velocity variations (high Standard Deviations) and severe vertical group stringing on your targets.
4. Suppressor Impact
Fast ball powders like H335 produce a high volume of unburnt particulate and intense muzzle blast when misapplied to large over-bored cases. Even with your oversized .30-caliber baffles providing a physical safety clearance buffer, the abrasive blast from H335 will accelerate throat erosion at your rifle's crown and unnecessarily pit the blast baffle of your Omega 300.
The Verdict: Stick with StaBALL Match
Winchester StaBALL Match behaves like a slow, smooth extruded powder but meteres with the consistency of a ball powder. It fills your 6mm AI case efficiently at 46.0 grains, builds pressure gradually to protect the thin TNT jacket, and burns cleanly through your suppressor.
Final Answer Restated
Under a new Markdown header:
Final Recommendation on Powder Choice
Hodgdon H335 is an unsafe and inefficient powder choice for a 6mm Remington Ackley Improved loaded with a 70 grain bullet, and you should remain with Winchester StaBALL Match to preserve bullet integrity and protect your suppressor.
What alternative powder or testing adjustment would you like to consider next?




User input: would Winchester 6.5 staball powder be better than staball match
AI Response:
No, Winchester StaBALL 6.5 would not be better than StaBALL Match for your specific goal of running a 70 grain bullet at 3,200–3,300 fps.
While Winchester StaBALL 6.5 is an excellent powder, it burns significantly slower than StaBALL Match (similar to H4350 rather than Varget). This burn rate shift introduces serious complications for your specific component combination.
Always verify your parameters with official data on the Hodgdon Reloading Center.
1. Burn Rate and Muzzle Blast (Suppressor Safety)
The Physics: Because StaBALL 6.5 is quite slow, it needs heavy bullets (like 95 to 105+ grains in 6mm) and high chamber pressures to burn completely inside a 24" barrel.


The Suppressor Hazard: Shoving a light 70-grain bullet down the bore means the bullet exits before a slow powder like StaBALL 6.5 can finish burning. This results in a massive amount of unburnt powder grains blowing directly into your SilencerCo Omega 300. This will dramatically increase muzzle blast, create a louder signature, and cause heavy, abrasive carbon/unburnt fouling inside your suppressor stack.
2. Velocity Risks (Bullet Destruction Potential)
The Data: If you pack enough StaBALL 6.5 into a large 6mm Remington Ackley Improved case to get a clean burn, it will easily push a 70-grain bullet to 3,650 – 3,750+ fps.
Catastrophic RPMs: At 3,700 fps in your fast 1-7.5" twist barrel, the rotational speed spikes to an extreme 355,200 RPM. Your thin-jacketed Speer TNT bullet will instantly vaporize into a cloud of copper dust as it exits the crown, severely threatening your suppressor baffles despite your oversized .30-caliber clearance.
3. Case Fill and Accuracy Node Incompatibility
Throttling Down Limitations: To force StaBALL 6.5 down into your target 3,200–3,300 fps window, you would have to drastically underload the case.
The Result: Throttling a slow ball powder backwards results in poor ignition, massive velocity variations (bad Standard Deviations), and erratic accuracy. Your optimized 2.382" CBTO seating depth will not be able to correct the vertical group stringing caused by an erratic, low-pressure burn.
Why StaBALL Match Remains Superior
Winchester StaBALL Match burns at a medium-fast rate (similar to Varget). This makes it perfectly optimized for light-for-caliber 70 grain bullets. It burns completely inside your 24" barrel, keeps your velocities at a safe and accurate 3,000 to 3,200 fps range (under 300,000 RPM), and keeps your SilencerCo Omega 300 clean and safe from high-velocity unburnt debris.


Final Summary
Stick with Winchester StaBALL Match. StaBALL 6.5 is too slow for a light 70 grain bullet, resulting in excessive unburnt powder fouling your suppressor or pushing the bullet to extreme RPM speeds where the jacket will fail.
What would you like to plan or confirm for your StaBALL Match load?