Need super rockchucker load data
- Thread starter JJFBANDIT
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dtech
New member
Which one do you have? The "Rock chucker" was built on the .308 case the "Super Rock chucker" was built on the .30-06 case.
I have boat-loads of data for the Super Rock Chucker. I have a couple and working on a third. My father was a gunsmith and built well over 100 of the Super Rock Chuckers in his time.
I have boat-loads of data for the Super Rock Chucker. I have a couple and working on a third. My father was a gunsmith and built well over 100 of the Super Rock Chuckers in his time.
hey i hate to butt in here but im looking for load data for a super rockchucker also(25-06 to 6mm).im using either 105 amax or 107 sierra mk bullets.i prefer h4831 and cci br2 primers but i want to know what will work the best.the gun has a 30 inch shilen barrel 1 in 8 twist.im not looking for fastest load,but the most accurate.ive had a few friends say reloader 22 or 25 but they have no measurements.any help you can give will be greatly appreciated.
thanks Jason
thanks Jason
Jack Roberts
Moderator - Deceased
Welcome to the board budracer1.
You might want to look at the 105 Bergers. They are very accurate and once they start blowing up you can switch to the 107 Sierras and get another hundred or so rounds from the barrel.
Jack
You might want to look at the 105 Bergers. They are very accurate and once they start blowing up you can switch to the 107 Sierras and get another hundred or so rounds from the barrel.
Jack
dtech
New member
I have never shot anything over 100 grains out of my Super Rockchucker but, in my opinion, the 4831 is going to be too fast. I have a load that my brother worked up for an 85 grain bullet using IMR 7828. Great accuracy, single digit standard deviation and doing about 3650 fps. I can check my load data but I don't think that I have ever used anything over 100 grains in the SR.
dan newberry
New member
I've used IMR 4831 in a 6mm-06 (basically the same cartridge) and had good results.
For Nosler's 95 grain Ballistic Tip, 53.3 grains of IMR 4831 shoots very tight. It'll do 1.5" groups at 315 yards--wicked load.
Moving to an 87 grain Hornady VMAX, 55.3 grains is where to be, again, with IMR 4831.
Tried RL22 also, which may serve you well.
Take a look at 240 Weatherby Mag data--that'll give you some ideas... work up from those starting loads.
We just gravitated toward IMR 4831 because... well... because we have about twenty pounds of it! /ubbthreads/images/graemlins/laugh.gif
Dan
For Nosler's 95 grain Ballistic Tip, 53.3 grains of IMR 4831 shoots very tight. It'll do 1.5" groups at 315 yards--wicked load.
Moving to an 87 grain Hornady VMAX, 55.3 grains is where to be, again, with IMR 4831.
Tried RL22 also, which may serve you well.
Take a look at 240 Weatherby Mag data--that'll give you some ideas... work up from those starting loads.
We just gravitated toward IMR 4831 because... well... because we have about twenty pounds of it! /ubbthreads/images/graemlins/laugh.gif
Dan
Quote:
I don't think that I have ever used anything over 100 grains in the SR.
the reason for the 105s or 107s is the 1 in 8 twist,i have seen 105s leave a vapor trail for about 65 yards and then detonate out of this gun when pushed hard.correct me if i am wrong please but it think that there is too much twist for the lighter bullets.Dtech what twist is your barrel.
thanks for the feedback though keep it comin guys.
Jason
I don't think that I have ever used anything over 100 grains in the SR.
the reason for the 105s or 107s is the 1 in 8 twist,i have seen 105s leave a vapor trail for about 65 yards and then detonate out of this gun when pushed hard.correct me if i am wrong please but it think that there is too much twist for the lighter bullets.Dtech what twist is your barrel.
thanks for the feedback though keep it comin guys.
Jason
Jack Roberts
Moderator - Deceased
Welcome to the board budracer1. /ubbthreads/images/graemlins/ooo.gif /ubbthreads/images/graemlins/grinning-smiley-006.gif
At least an 8.5" twist is needed for the 105 and 107 VLD bullets. It will shoot the lighter bullets fine until the barrel gets worn, then it will blow up all bullets. It will blow up the lighter ones a bit sooner because they are going faster and therefore at a higher RPM. A lot depends on the bullet. The 107 Sierras are good for a hundred rounds more than the 105 Bergers because of the different jackets.
A cool clean barrel will not blow up bullets for much longer than a hot dirty barrel. A hot dirty barrel in this caliber will normally start blowing up bullets by 600 rounds. It ain't a colony varmint caliber. A cool clean barrel may go several times that long before blowups.
Jack
At least an 8.5" twist is needed for the 105 and 107 VLD bullets. It will shoot the lighter bullets fine until the barrel gets worn, then it will blow up all bullets. It will blow up the lighter ones a bit sooner because they are going faster and therefore at a higher RPM. A lot depends on the bullet. The 107 Sierras are good for a hundred rounds more than the 105 Bergers because of the different jackets.
A cool clean barrel will not blow up bullets for much longer than a hot dirty barrel. A hot dirty barrel in this caliber will normally start blowing up bullets by 600 rounds. It ain't a colony varmint caliber. A cool clean barrel may go several times that long before blowups.
Jack
dtech
New member
Sorry about that. I guess I must have missed your question.
Like I had said in earlier posts, my father had built well over 100 rifles in this caliber. Over the years he re-barreled several of them for different customers. The range of barrel life was huge, there were customers that were shooting heavier bullets that claimed 15,000 rounds. On the other hand, he re-barreled a few that were shooting light bullets at blistering velocities that were talking 1500 rounds.
I have barreled a couple of them since my father passed away. The first I used a Douglas XX barrel and the second I used an Olympic Arms, broach-cut, stainless blank. I have about 2000 rounds through the Douglas with no signs of degradation. I am shooting primarily 85 grain bullets but I am using IMR-7828, and if you know what that stuff looks like you can imagine the throat is taking a beating!
Bottom line: I don't have personal data on a "shot-out" barrel yet. I am keeping track of what I shoot through them but I just don't shoot the volume with the bolt-action rifles that I once did.
Like I had said in earlier posts, my father had built well over 100 rifles in this caliber. Over the years he re-barreled several of them for different customers. The range of barrel life was huge, there were customers that were shooting heavier bullets that claimed 15,000 rounds. On the other hand, he re-barreled a few that were shooting light bullets at blistering velocities that were talking 1500 rounds.
I have barreled a couple of them since my father passed away. The first I used a Douglas XX barrel and the second I used an Olympic Arms, broach-cut, stainless blank. I have about 2000 rounds through the Douglas with no signs of degradation. I am shooting primarily 85 grain bullets but I am using IMR-7828, and if you know what that stuff looks like you can imagine the throat is taking a beating!
Bottom line: I don't have personal data on a "shot-out" barrel yet. I am keeping track of what I shoot through them but I just don't shoot the volume with the bolt-action rifles that I once did.
crapshoot
Well-known member
I have a 25-06 Ruger that I am thinking about rebarreling to 243 SR after i toast this barrel. Would like to get a super heavy barrel with break and make this a bench gun for chucks and p-dogs. I would like to use the lighter bullets (such as what you are using) , but not if that means changing barrels ever 6-800 rounds . Thinking like a 30" tube 1-1.25" diameter barrel. BR stock. What ya think? Am I tinkling in the wind?
dtech
New member
There are a lot of great calibers out there. The first reason I built my SRs was nostalgia. It was my fathers "pet" and I chose it for the very first gun I built because of it. After I built it, I realized the "old man" was much smarter than I had figured. The Supper Rockchucker is an amazing cartridge. Very versatile and capable of extreme range and blistering velocities.
The load development that I have done does not support the use of a 30" barrel. I could be wrong but my brother and I are shooting 85 grain bullets with IMR-7828 out of 24" barrels and getting just under 3700 fps. Maybe if you were shooting heavier bullets, but with the 80-90 grain class I would think that 30" would be over-kill. The load that I have been talking about does yield consistent, single-digit standard deviation. I think that combination, in and of itself, would make a great "chuck" gun.
The load development that I have done does not support the use of a 30" barrel. I could be wrong but my brother and I are shooting 85 grain bullets with IMR-7828 out of 24" barrels and getting just under 3700 fps. Maybe if you were shooting heavier bullets, but with the 80-90 grain class I would think that 30" would be over-kill. The load that I have been talking about does yield consistent, single-digit standard deviation. I think that combination, in and of itself, would make a great "chuck" gun.