Re: Which factory 308 Win
The 700 PSS and 5R are always sure bets for good shooters. The PSS is a 26" 12x and the 5R is a 24" 11.25x
To answer your question about the 12x and 175's, the 12x is very optimum for the 175 SMK's and 178 AMAX's. You will find stability factors of about 1.5 with the 12x and 175-180 grain pills at 308 velocities. It will also handle the 190 SMK's or VLD's and most 200 grain bullets.
IMHO, a 26"12x barrel is perfect for the 308. I have also had great success with the 24" 11.25x.
My 308 is at the shop right now getting a 26" 11.0x barrel installed. I plan on shooting 190VLD's and 208 AMAX's out of her.
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.