When I'm thinking of mounting a scope on a double rifle I get the weights of the scope and rings. I then cut a lead weight to match. I attach the lead where the scope would mount with rubber and hose clamps. It requires a little cutting of the lead to see the sights. Undoing the whole thing to reload is a pain in the butt. Fire 4 to 6 pairs, and you will know if reregulation will be required.

Dave