How tight are you tightening the rear reciever screw?
Did you bed yours?
Did you try a pressure pad under the barrel?
What kind of accuracy were you getting with what componants?
With a GM fluted barrel and Winchester PowerPoint I'm getting sun 1/2" at 50 yds. I just snugged the rear about the same as the front. I haven't yet tryed shims or bedding, I wanted to check the baseline accuracy first.
