Hey Bill, I know this sounds totally off the wall,..but it worked for me on a few occations. Mount the rings just to snug without the top halves of the rings. Flip it over and see if the rings sit flat on something like a kitchen counter top. Keep snugging the mounts to the action a little bit at a time until you feel they are tight enough. But make sure they both sit flat on the smooth surface. The same thing can be done with a wooden 1"/30mm dowel (dependant on scope tube diameter of course),...A broom handle will work as well,..sometimes.Just take your time what ever course of action you take,..and I'm sure your problem will be solved. Don't forget to re-zero your rets as well!!!! Best Wishes, tjk