Most of the brand name factory loads I've seen will not realize the potential of the rifle. Drover is right on with the center screw. I wouldn't touch anything until trying the rifle with a known ammo, something on the order of Federal Gold Medal Match, with a proven scope with very little parallax. Since you are a campfire member, we can assume that you yourself can easily shoot sub moa groups all day! long, so that's not a factor. Don't fix nuthin' until you are damn sure it's broke. My 5 centavos worth.
