I shoot the same rifle, but I have a Leupold 2X7 on it. I'm shooting 150gr Hornadys in handloads in it. Very accurate, have yet to recover a bullet from a deer. As far as factory ammo goes, your right on track, besides which most .308 ammo is going to be in that weight range anyway. Try a few and see what your rifle likes best.
P.S. Welcome to GBO, You have a great gun there. Enjoy it!