Ditto on what sk330k said , My SS 12" wears a weaver alum. base with weaver 30mm rings and a red dot , shoots real good , never moved. My 357 Max has a weaver alum. base with Burris Signature rings and a 2X Weaver, nice outfit , hasn't moved yet. I had a 460 Mag barrel , had lots of trouble getting the scope to stay put. Ended up with SSK 6 screw mount , Leo vertical rings , 3 of them , seemed to have solved the problem. Good luck