The 2 screw military side mounts for the No. 32 scope on the Lee Enfield N.4(T) had a good reputation for returning to zero, but they relied on big thumb wheels compressing 2 stout springs to ensure return to base centres.

The test is to zero, remove, reinstall carefully, shoot 3 rounds, remove , reinstall, shoot another 3 etc. plotting each group accurately.

After about 12 rounds you should know the answer, but if the group centres fall within a 1 inch circle you are doing very well.