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1/7 twist can shoot anything from 40-80 grains.
1/8 - up to about 77 grains, depending on bullet length.
1/9 can shoot up to 69 grain or so on longer barrels.
1/12 is pretty much 55 grain and less.
Last edited by rsilvers; 07-31-12 at 11:33.
Thanks! I know I have shot 40gr VMAX from a 1/7 twist and it did fine, I just didn't know if the lighter projectiles had more fleet yaw than safe near the muzzle before settling down with the higher twist rates, and how that translated to safe use of a suppressor, if it existed.
If its grouping well down range and nothing looks odd I would not worry about using 55 grain bullets.
I use 55grain handloads pretty much exclusivly in my 12.5 with aac m4-2000.
several thousand rounds of a mix of handloads, m193, and wolf. no baffle strike with my 1/7 12.5
2,000 suppressed rounds through LWRC M6A2 10.5" with Federal XM193 here. Zero baffle strikes on Surefire MINI and FA68K.
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