I would recommend slowly and carefully working up from about 67 gr. of H4831 to a maximum of about 70.5 gr. I am assuming you know how to reload and read pressure signs. In my dad's gun, this load produced 3266 fps. If you sight in 3" high at 100 yards, and at 8,000 feet elevation, you should be right on at about 335 yards and only 7" low at 400 yards. Pretty flat load. Good luck. Roskoe.