My 52D standard barrel, prone model, presently has a Vianni scope mount, but I've run out of elevation to go beyond about 100 yards. I have a Golden Eagle scope on it. What are my options to get out to 2-300 yards? I don't think Mr Vianni makes them anymore, and the EGW website just shows 0 moa bases. (not willing to drill my gun. Had it since 1962) Any info is appreciated. Thanks........Tommy