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All things 300 AAC BLACKOUT
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PostPosted: Sat Apr 07, 2012 9:03 am 
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I've played for years with a smaller 30 caliber cartridge that I've use bullets like the 110gr Barnes TSX on up to the 155gr Sierra Palma Match. I wanted to move up in cartridge size and try the 300 BLK and wondered if barrel makers might start making barrels with a little slower twist rate -- something in the 1:10 or 1:11 twist rate for those that just want supersonic. I'm shooting through a 1:10 twist barrel now and like the accuracy -- I just want to upgrade the power level.


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PostPosted: Sat Apr 07, 2012 9:14 am 
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Sure - any barrel maker can just use a 308 blank and do that.

For me I would still want 1/7, even if it were just for supersonic, because it helps the bullets expand on impact.


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PostPosted: Sat Apr 07, 2012 9:47 am 
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300Blk wrote:
Sure - any barrel maker can just use a 308 blank and do that.

For me I would still want 1/7, even if it were just for supersonic, because it helps the bullets expand on impact.


I will say that I have had second thoughts about going with a barrel that was non-standard and that bit of info about expansion is just another reason to go with the standard.


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PostPosted: Sat Apr 07, 2012 9:53 am 
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When are we going to see the 1/7 AAC barrels for sale? I am waiting on a 16" ar barrel.


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PostPosted: Sat Apr 07, 2012 10:44 am 
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I don't know. That is up to the production manager.


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PostPosted: Sat Apr 07, 2012 9:55 pm 
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300Blk wrote:
For me I would still want 1/7, even if it were just for supersonic, because it helps the bullets expand on impact.


I wish this was decided on from the beginning =/

but then again, things never end the way they start.

Most people are waiting on 1:8 barrels, and 1:7 isn't even in sight yet, but we have SMEs saying 1:7 should be wtg


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PostPosted: Mon Apr 09, 2012 8:26 pm 
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Does twist rate have anything to do with accuracy/group sizes? I recently purchased an M&P15 that shoots either 300 whisper or blackout. and the best that I have been able to get is a 3 1/2" group at 100 yds, using both factory Hornady ammo and handloads. My belief has always been that a fast twist rate is meant to shoot the longer heavier bullets. My .308 bolt gun has a 1-10" twist rate and it shoots 150-168 grain bullets really well, but not so much the lighter bullets. Anybody have any insight into my dilemma?


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PostPosted: Mon Apr 09, 2012 8:50 pm 
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With 125 grain Remington Premier Match and 115 grain Remington UMC ammo I have been getting great groups from my 1 in 8 twist Noveske barrel.


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PostPosted: Mon Apr 09, 2012 10:05 pm 
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Well, we have done 50 round groups with the 1:8 barrels from test fixtures. That is 10 groups of 5 shots per group. The average at 100 yards - 0.85 inches. The twist is not a problem to accuracy, assuming the bullets and barrel are otherwise good.


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PostPosted: Wed Apr 11, 2012 12:41 pm 
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300Blk wrote:
Sure - any barrel maker can just use a 308 blank and do that.

For me I would still want 1/7, even if it were just for supersonic, because it helps the bullets expand on impact.


I don't know alot about custom barrel makers. Who would be a reasonable and trustworthy barrel maker for a 1/7 SBR barrel to be made from a 308 blank? Also can we get a petition going to send to the production manager to help him decide to switch over production to 1/7 units.


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