My pref is for 1:12 they shoot 147-169 very well. 1:10 is more friendly with 160-220. I find 1:12 far more useful in 308 as the small case capacity really doesn't lend well to 170+ loadings.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent
I have a old 788 rem with a 1-10 twist barrel that seems to prefer longer 150 to 165gr bullets but 125gr NBTwill still shot moa too if I have a good day shooting . I have not shot any bullet over that weight .