Best Twist Rate?

[jhertzler]

Is either a 1/7 or 1/8 OK for a twist rate for variety of bullet wts. for 300 BLK? Thanks.

[keith13b]

It really doesn't matter unless you plan to load very heavy projectiles.

[randyrucker]

Either.

[FormerNavy]

What about for shooting subsonics? I am new to this round but thought I had been reading that 1/8 wasn't sufficient for the heavier subsonic rounds.

[gds]

first off welcome. Secondly it depends.

I have a
AR 15, 16 inch 1/10
AR15, 9.5 inch 1/8.5
Model 7, 16 inch 1/7

All three of them will stabilize my 247gr cast rounds. I have even loaded them subsonic in my .308 savage with 1/10 twist and can put 3 in the same hole subsonic at 50 yds

that having been said, some guns just done seem to work well with the heavier bullets. Mine just happen to.

[smustian]

I think the general concensous is the heavier the projectile, the faster you want your twist rate.

[Dolomite_Supafly]

YOU MUST VERIFY THESE BEFORE SHOOTING THROUGH A SUPPRESSOR. ALL GUNS ARE DIFFERENT SO VERIFY.

Here is what I have found with my guns.

At subsonic velocities:
1/10 twist will stabilize bullets up to 200 grain jacketed and up to 245 grain cast
1/8 twist will stabilize bullets up to 220 grain jacketed and over 245 grain cast (I have no cast bullets heavier that 245 so I have no way of knowing where it becomes unstable)

[AR-300]

either will work fine
S&W splits the difference with 1:7.5 barrels

[BladedroninX]

Either is fine

[tfbit]

1/7 or 1/8 is fine but AAC moved to 1/7 from 1/8 for some reason and Noveske makes them 1/7. That being said, I'd have no problem buying another DD 1/8 barrel or 1/7 if they ever switch.