Check with talley? I recently ordered some 10mm rimfire rings with the contour OP mentions for an anschutz. Might make the same in 3/8”?

Golldammed motion detector lights. A guy can’t even piss off his porch in peace any more.

"Look, I want to help the helpless. It's the clueless I don't give a [bleep] about." - Dennis Miller on obamacare.