Superbrad, if the two scopes are mounted in the same height rings the center of the scopes will be at the same height (the cheek weld will be the same)....you must raise the mount 5mm for the bell to clear the barrel, that is the only difference.
The ring size is the same, only the height of the ring must be 5mm higher.
That's the exact problem...... on many rifles you cant use them in the same rings.....
But just an FYI, the tube size is the same....... if you mount a 1" tube in 3-9x40 then decide to go with a 3-9x50 for some reason, your crosshairs are still centred in the same position as only the body is in the rings and not the objective bell.... providing you can mount the 50 in the same rings........
In essence, you would not have changed where the "body" of your scope sits in the rings and there would be no adjustment necessary other than the regular sighting in anew scope routine.....




















































