You don't need a reloading press of any kind for black powder loads in brass hulls. There are some simple kits that cost about $30 or so, available from outfits that sell black powder accessories. Basically, you knock out the spent primer with a thin rod while the case is supported on a block with a 3/8" hole drilled in it for the spent primer to fall in. Many of the brass shells are meant to be reloaded with standard primers, and I'd recommend going with those. Magtech, for instance, takes large pistol primers. To reprime, a primer cup is placed open side up on a flat metal plate. Center the hull over the primer, place a large dowel into the hull, and whack the dowel with a hammer. Obviously, don't lean over the dowel, as it's not uncommon to set off some of the primers doing this. Wear safety glasses, and all will be well, as the dowel only jumps a little bit.
Hodgdon's Pyrodex shotshell loading data will get you off to a good start as far as charge amounts (just use black powder, volume for volume, instead of pyrodex). Your shot column height will not be too critical, but you can adjust shot charge and wad column height until you're happy. You'll probably need 11 gauge size cards and wads to reach across the inside of a thin brass hull. Brass hulls aren't crimped, you simply seal them up with an overshot wad. I prefer clear silicone sealant (NOT CAULKING), and just a pea-sized dab will hold the overshot card in place, once you smear it around the inside edge of the hull, over the top of the card, with your finger tip.
