Originally Posted by Run With The Fox
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

With not much more effort you could head fringe shoot with a tight pattern, especially the geese and take home game for the table.
Pillow casing birds deliberately and repeatedly on any rough syndicates I’ve been involved in would result in you having to leave the field and your membership of the syndicate cancelled. I can’t think of anywhere in my experience where such behaviour would be tolerated.