SWFA is a good place to go to for optics and mounts also try Sport Optics, Euro Optics, Optics Planet. I believe SWFA used to or still has a price match system. When you start paying high dollar money on these scope you are paying for glass quality/clarity as well as how the turrets are designed built, brass vs. plastic, the ability for the scope to return to zero after dialing up and down for windage and elevation and zero stop, lit reticles. All the scopes NoFail mentioned are good also look at Burris. I would however recommend that you research before you buy when it comes to the type of reticle you want. Such as Bullet Drop Comps on some of these scopes are calibrated to use certain bullet weight / velocities that you may or may not use.
168 FGMM has always shot excellent in every .308 both semi and bolt action that I have owned. The POI can shift depending on the ammo that you use. When you can buy in bulk so that you have the same lot number. It insures a more consistent powder charge as you can see from 1/4 moa to almost 1 moa shift on POI from lot number to lot number.