I have recently had woes. On a 1895 one piece base, the dove tail was so loose, you could turn in the bottom Leupold ring with two fingers. Figured bad rings. Tried another set and still loose. Turns out to be the base.

Had a strange issue where the torx screws were not mated well to a set of rings. Had to take them back.

On my 460Smith, I am having trouble holding a scope. But I have tried 3 sets of rings and all have trouble. Currently using maximas and they are holding. Believe it or not, leupold customer service is telling me to mount my scope so it touches errector assembly so it won't move. Kinda shocked me.

But if I lap my rings, I can't say I have much problems.