Re: Rate of Twist for 308win
The 1-12 twist will work well with 150's up to the 190 SMK. A sweet spot for the 12 twist at 308 velocities is the 178 AMAX and 180 SMK. The original green hill formulas put the 12 twist at the 168. Modern twist calcs show a bigger bullet such as the 178-180. Shoot em all and settle on the best one for YOUR barrel.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.