Been reloading pistol rounds for 30 years. I think I'm going to buy a Lee loader and load me some 12ga. How hard could it be, really? Same thing, only with those little plastic thingies and then crimp the ends.
Looks like Amazon has the press, the plastic thingies, and shot. I can find powder locally, and I think shotgun primers are easier to find than small pistol, which are as rare and expensive as unicorns.