I have a Winchester Model 70 Westerner .264 WM 26″ barrel. I’ve been shooting it trying to find a load for it. Wasn’t grouping at all. Using slow bruning powder ie. IMR-4350, H-1000, H-4831 and short 129, 130 grs. bullets………Took it all a part, cleaned it up. Took about a 1/2 pound of copper fouling out of the barrel. Bore looks great…..Now got it all back together and still not grouping well. It’s somewhat better. I’m thinking it should be shooting 1 MOA at 100 yards off the bench…. 

 Could it be a torque issue with the 4 bottom screws?     Any thoughts on this?