a buddy of mine spent alot on a 300wsm of another manufacturer. he had same issue. he couldnt hold groups at 50 yards. they wher everywhere. we checked everything, and all was tight no play or etc. finally we found the issue, it was the rings they didnt put egual force around the tube of the scope and made major pressure points. and damaged the scope internally somehow. and his poi always changed. he changed rings, base, and scope. and solved the issue. I beleive midway sells a product that trues your rings now that would have helped my buddy.