Look again.

See the deformed clamp nut nose. That's the problem.

This doesn't loosen the screw so you turn it with you fingers. But when you use a screw driver you can feel the screw is looser. The base moves but is still tight.

In fairness I must say that every Ruger I worked on did not have this problem. But I did see a lot of them.

My 22-250 had the problem and I sent the screw and clamp nuts to Ruger at their request with a note. Got no response to the note, just a new set of rings. Those replacement rings work great and I have about wore that rifle out.

I suppose I should just send these rings back to Ruger and see if they send me repelacments and stop my whining.

Never had this problem with my Martini's!