Question about twist rates and supersonic bullets.
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Question about twist rates and supersonic bullets.
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.
Re: Question about twist rates and supersonic bullets.
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.
For me I would still want 1/7, even if it were just for supersonic, because it helps the bullets expand on impact.
Re: Question about twist rates and supersonic bullets.
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.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.
Re: Question about twist rates and supersonic bullets.
When are we going to see the 1/7 AAC barrels for sale? I am waiting on a 16" ar barrel.
Re: Question about twist rates and supersonic bullets.
I don't know. That is up to the production manager.
Re: Question about twist rates and supersonic bullets.
I wish this was decided on from the beginning =/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.
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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Re: Question about twist rates and supersonic bullets.
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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Re: Question about twist rates and supersonic bullets.
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.
Re: Question about twist rates and supersonic bullets.
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.
Re: Question about twist rates and supersonic bullets.
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.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.
Victor Lopez
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