Weldwood contact cement. Clean rings and scope before applying. will not set up before the scope is placed right in rings. rings and scope can still be taken apart whenever need be and cement can be removed with Cutex fingernail polish remover.
It is my "go to" whenever scoping a hard kicker.
Have never had a scope move no matter what the recoil.
I have some heavy kickers.
Sounds scary using contact cement but no problems.