I don't want to rain on anyones parade but, a small amount (7lbs.) of 1 shot size will cost you far more then a brand new Mec reloader, the small container of bismuth will be about $200 landed here in Canada. Before going any further, I would research the price of both bismuth and heavy shot, landed here in Canada. Seven pounds of shot will give you 84 shells of very light duck loads, it would be far less expensive to make your shotgun steel friendly, or even buy a new gun that will use steel shot, it would be much cheaper and less hassle.