Whichever one shoots best...
I've got a 1/12 that loves 165-168 gr. Bullets. No makey no sense, but it shooots them a ton better than the 150-155 grainers.
It has a short tube on it, so I wish it liked the lighter bullets better so I could get the velocity up, but it is what it is...
actually, as i understand it, the 1-12" is ideal for 168 SMKs. my 700P prefers them as well and it's a 1-12.
I honestly don't think there is a .308 that won't shoot the 168 matchkings or Federal Gold Medal Match loaded with them. I had a 700LTR that loved them, as do both my kimbers.
But my understanding is that the 1-12" was designed to stabilize the 150 class bulllets and the 168-170 were getting close to the end of its ability to stabilize. None the less I have a few cases of 168gr. FGMM and they work, even in a buddies 1-14" tube... never tried them on game, but they go where you want them to...
