If you look at this pic at maximum magnification, you can see the marks where the scope slid forward in the front ring that was resting on the dovetail radius, during the first 20 to 30 shots, until its forward move was blocked by its ocular shoulder coming to rest on the rear ring, and you can see where the front edge of the front ring dug into the dovetail and shifted position accordingly until it was re-installed back 1/4" or so...
And, trust me, it had nothing to do with improper rings, scopes, or installation (everything was degreased, rings were lapped, screws were torqued, etc. etc.)...
