300BlkTalk

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.

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.

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.

When are we going to see the 1/7 AAC barrels for sale? I am waiting on a 16" ar barrel.

I don't know. That is up to the production manager.

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

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?

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.

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.

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.