Sir,

the twist rate should be determined by the bullet weights that you are wanting to shoot...

I just finished building a heavy barreled 223 Ackley Improved on a Stolle action where the barrel had a 1-7" twist! This gun was buils specifically for shooting Sierra's 80 gr. and 90 gr. B.T. - H.P. MatchKing bullets as well as Hornady's 75 gr. A-MAX. This gun will be used for 600 meter and 1,000 yard shooting...

Decide on the weight of bullets you want to shoot and the distance at which you most likely will be shooting and let that be the deciding factors in determining the appropriate twist rate....

DAVID