Unless ranges are quit short a scope will not return to zero exactly and is usually an inch of two off, especially in a double rifle...I always hear otherwise but when properly tested I find this is true with about any QD mounts...I have Talleys on all my bolt guns but when I take them off, I leave them off until I have a chance to check them with my bore sighter or take a shot at a target before I go back out hunting...

An inch or two may suit some, but not me, I might have to poke something mean in the eye...and I want to hit that spot dead center...add that inch or two to my wiggle and it could be a serious miss...