Willar j. Ok i have a 40mm mueller scope. 20moa egw base and plan on using swfa mounts (low) which measure 20.32mm according to th we site....i put in .45 on scope mount +barrel taper height (unsure if that was correct) gun is a savage 11vt which is a heavy barrel...can u check this for me. Im getting a pass but want to be for sure before i order