depends on the rifle old M16s used to have 1:12 this was designed to stabilize 55gr projectiles in arctic conditions, or regular conditions for that matter. Now-a-days....were using heavier bullets. 55 and 69 grain projectiles. m193 and m855. The military commonly uses 1:7 twist rate. My RRA rifle has a 1:9 twist rate and I haven't found a bullet it wont stabilize. I have shot 75 gr. (too big to feed from the mag) and a 40 gr v-max. I dont want to go heavier or lighter...so 1:9 is perfect for me.
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