To my earlier suggestion of 7/8 oz 12 gauge loads, I use this load in my Light Twelve A-5. I got this tip, and spring, from Art’s Gunshop (a/the top Browning outfit in the U.S.): use a worn recoil spring for these loads. Never a hitch, light recoil, surprising effectiveness. When going to heavier loads, be sure to put a full strength spring back in.
