I can't imagine being able to reprime the rim of a spent .22. I used to reload (even had a melting pot and forms to cast .45 slugs) but got out of it because it can be difficult to ensure uniform firing characteristics and have "overcooked" some hot loads and was lucky to not destroy a weapon and maybe myself (.45s aren't supposed to leave the muzzle at over 1400 fps from a 1911). I never saw or heard of any home kits/devices for reloading rim fires, but then again, I never looked.
Back in the olden days, rim-fire was all there was, and it was considered a step up from caps and Minie balls. Once had a .32 rimfire revolver for a little while. Since it was black powder, it was legal, and since now nobody makes any rimfire except .22s, it was moot. I wonder how they did it, though. Would have to look up old patents to see. Since we’re talking about the theoretical do-ability of gun and bullet manufacture as a clandestine cottage industry, this ought to be looked into.
I was always told rimfires were reloadable. 1400fps from a 45acp?? Holy Mackeral! I never buy reloaded ammo that has been reloaded by some guy in his basement. The “grenade” load or even squib rounds are a big enough fear I just go with factory ammo and maintain a peace of mind.
I meant to say NOT-reloadable. My bad.