[Formerly YB-2]

Originally Posted by Yamaki

I've successfully narrowed the groupings to less than 2.5" at 300 yds with the rifle. That's as good as it's gonna get unless I change out the barrel to a bit tighter twist.

While I agree that a new barrel configuration would be a help, going to a tighter twist will have not help much, if at all. Most .308 shooters that I compete against shoot the same 10" twist your barrel has and shoot bullets as heavy as 185gr. The problem is the 16" long barrel. 20" is pretty much the minimum length to shoot tight groups at anything past ~200yd (yes, I know there are exceptions). You might be interested in the new NRA Tactical AR competition. Any AR10/15 based rifle with a max 20" barrel and 12x (max) power scope and Harris-style bi-pod competes at mid-range distances (typcially 200/300/600yd). With a 20" barrel your SR762 would be a prime candidate.