The banning of lead shot, was at a time when duck numbers were low and duck hunting was almost a lost sport. What a better time to make the ol'boy's old guns shoot steel. Not much fight left in that crowd - so hundreds of thousand of shotguns were put away. One of the many twists and turns in disarming America.
Thim olden guns, kept behind kitchen doors will be your last ditch defense against UN troops.
...and what a wonderful revolt it'll be - the always poor, the newly poor and the overtaxed rich all taking up torches and dem old guns not fit for steel.