Originally Posted by ;91014
I have a friend who built one(22-250 AI) with a 1 in 16" twist.It would stabilize 55's ok with the added vevocity of the AI chamber.I do think it will work if you load it warm enough.
I bet he has a 12 twist barrel, and thinks he has a 16 twist. Most 55's will work in a 12 twist, but not always work in a 14 twist. Velocity has nothing to do with it, it's the rate of twist everytime. Many moons ago folks felt that it was the rpm of the bullet on impact, but that idea has gone south (I was an RPM guy). Now there is a formula that they figure using the B/C and the diameter multiplied with a guide number of your own choosing (I use .85).