Not to try and hijack this at all, but I've read the Lee book but still dont quite gather why he says not to use Feds or Rems in the AutoPrime. As far as I know, I've never heard Lee was in cahoots or anything with any other manufacturers, so why wouldnt this thing be dangerous with other primers? Pistols with worn firing pins or too light hammer springs wont set off some primers, let alone a tool with a slow steady push with a force distributed over about 95% of the surface area of the primer. I've crushed a few primers to half their size in my tool and still havent had one go off. I just dont really see how it'd be possible to blow this thing up. Anyone got any ideas? I'm not about to go seeking a way to blow a tray of primers, I just want to know how it'd even be possible.