300 Blackout Subsonic Load Data

wolverines

wolverines

Well-known member
I'm wondering if anyone has some data for loading subsonic rounds for a 300 Blackout using a Hornady 190gr Sub-X bullet (part# 30730)?

I'm shooting a Ruger American Ranch bolt rifle with a 16' barrel 1:7 twist.

Factory loads shoot good and I'm happy with the performance of the bullet so I really am not interested in other bullet options.

I've never loaded for a sub-sonic round before. I understand the process is reversed and you need to work down to sub-sonic speeds, but I'm at a loss from there as to what powders understanding case volume is a factor. I've heard good and bad about AA1680, but I don't have any and there's nothing available near me in driving distance. I've seen some data with VV N120. Again, I don't have any and these were guys loading for short barreled pistol ARs.

The simple answer would be buy more factory rounds, but the cost of factory has went way up and availability is way down. I just want to load to as close to a factory round as I can.

Thanks in advance for any info.
 
Last edited:
Not much activity here with that specific combination.
Trajectory is going to be like a 22LR.
I've done a little with 308 subsonic using Trail Boss, but that case is much bigger.

A QL sim of 300-BO 180 gn round nose using full load of Trail Boss (5.1gn) gave ~960 fps.
The case and a long projectile don't give enough powder volume for Trail Boss to do much more.
But Trail Boss is a relatively safe powder to experiment near subsonic speeds.
If the powder volume could be increased by pushing the projectile further out,
maybe have to single feed, might get near 1100 fps - maybe.
Trail boss does not compress nicely, so that's not a good option.
 
if you're going to reload subsonic - you NEEED a chronograph. its no longer a "maybe" tool. its a NECESSARRY tool.

please keep that in mind. the difference between a successful bang and a kaboom when testing with subsonics without one is just too close for comfort. its not worth your firearm or your personal safety to do otherwise.
 
I emailed Hornady directly for the load data. They will send it to you for 190 sub-X and CFE Black (if memory serves).

You can also go on .300blk talk and there is a ton of data there, too.

TC
 
I have used Re7 with great results. AA 1680 is another popular one. I prefer Re7 because I can get it. I haven't loaded subs in a while but Hornady sent me the data within the last 6 months.

TC
 
Thanks for the replies, appreciate it. Tough finding powder right now. Hoping to find a recipe with something I own. I’ll keep searching. Need to get that data from Hornady too.

The 190gr sub-x has been great for me all summer on woodchucks out to 100 yards. Super fun to shoot.
 
Originally Posted By: TonesterI emailed Hornady directly for the load data. They will send it to you for 190 sub-X and CFE Black (if memory serves).



TC

Apparently not anymore. They (Hornady) said I could get it on their app if I pay $19.99 for the 11th edition of their book.
 
with their app - you can buy a single caliber for $0.99

the $19.99 is to buy the complete edition


if you purchase the digital edition after the 11th edition is printed, you will receive a copy of that shipped to you as well for that same $19.99
 
I saw that. Tempting. So what's the advantage of renewing the yearly subscription if they are going to send you a copy of the book (which is supposed to be released fall of 2021)? Seems like for $20 it would be worth it the one time fee, basically getting the 11th edition digitally now.

My buddy has the 10th edition which he says does not include the 190gr sub-x bullet. Hornady's app lists it, so I'm wondering if I should just buy the single cal data for .99?
 
Last edited:
ive owned 10th since a few weeks after it came out. i also have 8th and 9th. as such if i needed some specific data - i'd probably go the $0.99 route, until at least the 11th was released and the $20 got me both digi and print copy.

i guess if you were playing with every new bit and bob out there - the annual subscription would be beneficial. or if you were the type of individual who loved to ensure you had the absolute latest greatest of everything, just because thats your thing.

otherwise - from a personal standpoint at least - i see no benefit to the annual subscription option.
 
I've worked up some subsonic loads for my two 300 blackouts. One has a 10" barrel and the other a 16" barrel. Adding barrel length or adding a suppressor turned a subsonic load into a supersonic load easier than I thought it would. I'm not at home right now but would be happy to share CFE blackout powder data with you if you send me a PM. Hodgon's website does have some free load data you may want to check out. The best thing to do is test your gun and suppressor to see what load is best for you. My loads may or may not work well in your gun.

I was really wanting to shoot my 300 blackout suppressed at coyotes but now that I have the suppressor and load worked up I haven't taken a 300 blackout on a stand with me yet. It is hard to give up the flatter trajectory and proven performance of my 223's, 6mm Creedmoor or 22-250. I would arguably feel more confident in killing coyotes with only my shotgun on a stand than having only my blackout. The suppressed blackout AR's still have a loud sound from the action cycling. A bolt 300 blackout suppressed with subsonic would be much more quite.
 
I just paid for the 300 Blackout date (it's just .99 right). The 190gr bullet referenced is the Interlock bullet (which is discontinued) and the data is not subsonic. I'm a little disappointed, but I think it will still be helpful as the 2 powders I've read a lot of hand loaders using (AA1680 and VV n120) is listed which should serve as a good starting point.
 
Originally Posted By: BrianIDI've worked up some subsonic loads for my two 300 blackouts. One has a 10" barrel and the other a 16" barrel. Adding barrel length or adding a suppressor turned a subsonic load into a supersonic load easier than I thought it would. I'm not at home right now but would be happy to share CFE blackout powder data with you if you send me a PM. Hodgon's website does have some free load data you may want to check out. The best thing to do is test your gun and suppressor to see what load is best for you. My loads may or may not work well in your gun.

I was really wanting to shoot my 300 blackout suppressed at coyotes but now that I have the suppressor and load worked up I haven't taken a 300 blackout on a stand with me yet. It is hard to give up the flatter trajectory and proven performance of my 223's, 6mm Creedmoor or 22-250. I would arguably feel more confident in killing coyotes with only my shotgun on a stand than having only my blackout. The suppressed blackout AR's still have a loud sound from the action cycling. A bolt 300 blackout suppressed with subsonic would be much more quite.

Yeah, mines a bolt. It's incredibly quiet with the factory Hornady 190gr sub-x. I've taken a half dozen woodchucks with it out to a touch over 100 yards.

I agree with not wanting it on a calling set. My primary want/need is to just be able to shoot it. I'm down to just 2 boxes. I think it would be a great option for watching a carcass pile that you know the distance the coyote will be at.

Sending PM
 
Originally Posted By: BrianIDI've worked up some subsonic loads for my two 300 blackouts. One has a 10" barrel and the other a 16" barrel. Adding barrel length or adding a suppressor turned a subsonic load into a supersonic load easier than I thought it would.



sometimes its not about length alone... barrel construction/material can come into play

i have both a 9" and 16" 300 blackout ar. my 9" barrel - using the same subsonic load that i originally developed for my 16" barrel - is actually FASTER than the 16" barrel... enough that i had to knock ~0.3gr off the load to ensure it was subsonic in both barrels without having to make a unique load for both.

the 9" barrel is melonite, and the 16" barrel is stainless.

thankfully the bit slower load still shoots well in the 16" rifle, as well as my 16" single shot rifle. that single shot i have several special loads for that the AR's dont get of course... but it still performs well with that 208 amax load i did specifically for the ar's too!
 
Originally Posted By: Plant.Onebut it still performs well with that 208 amax load i did specifically for the ar's too!

Have you hunted at all with the 208gr Amax? I'm pretty sure that bullet is discontinued and has been replaced by the 208gr ELD-M, but I think it's doubtful that either one would expand at subsonic speeds.
 


Write your reply...
Back
Top