Hey Stan. I've been using steel shot in my 3 12 gauge M12's for 30 plus years- no damage to the muzzle area of each of these fine repeaters, none whatsoever. All are full choke, which prefer, as I enjoy "pillow-casing" decoying mallards and geese at 25 yards and closing, and a full choke will do that, assuming the proper lead and follow-through on the part of the gunner. RWTF


"The field is the touchstone of the man"..