I had a set of those Weaver "Swing Off Mounts" on a Remington 760 Gamemaster 30-06 with a Weaver 2 1/2-7X scope. I carried that rifle, it was my only deer rifle at the time, from the late 1960's until around 1992 when I sold the rifle to a friend.

I seldom move the scope over but the few times I did it seemed to always return to zero, and that mount retained zero very well no matter how I bounced the rifle around. It was a system that worked.