Folks on this board don't buy reamed out Sterlingworths. There was a dude who bought 20br with blown barrel, but he was not a poster here. The post came from his good pal who is a member here.
Local shop has just the thing for the promo shells. Sakaba 500 'MAGNUM' O/U with 76mm chambers in great shape for $450. I might even buy it just to throw into into flat-bottomed duck boat.