300AI Twist Rate

M

MCloyne

Guest
Building a new 300 AI and I am trying to decide which twist rate would work best for 210 gr bullets. I am thinking either a 10 or 11 twist rate should work.
Any suggestions would be appricated.

Larry
 
I would go 10 in case you want to shoot a little heavier bullet down the road. That being said no one will believe me but I shoot Berger 210's out of my 308 at 2350 fps in a 12 twist barrel, 3/4 MOA 10 shot groups at 300 yards.
 
11" is plenty

1 in 11" is what I shoot in my Light and Heavy Guns w/ the 210s. Most of the guys I know are shooting 11" twist w/ the Ackley.
 
Have an 11 for 200 gr Knight BT's. Shoots great but had problems stabilizing a 220 gr Sierra. This is a standard 300 WBY. With the AI I would go 10TW and see if the 240 gr's shoot well.

Honestly if 210 gr is your bullet of choice, get a 300 WSM. Your life will be much easier.
 
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