You don't need a press to load brass shotshells. Check around, see if you have one of those sets of jewler's screwdrivers. Try each one of those until you find one that will fit through the primer flash hole. Pop the primer out with one of those. Use a large socket to put the case on.
Use a smaller socket, say a 7/16 or so on a four or six inch extension to reprime. Just put the primer on a chunk of flat scrap steel and tap the case down on it. Depending on what kind of brass shell you use, your wad colum will vary. I use Mag Tech shells, they take an Eleven guage overpowder wad. I then used an eleven guage fiber wad, still do, sometimes. Mostly though I use a Winchester Twelve Guage AA plastic red wads, my patterns are better. Yeah, I know the plastic wads ain't period, I don't care, the knockdowns fall better.
I have been fillin my shells with a 7/8 ounce dipper full of #6 shot and then the rest of the way up with #9 shot, not sure why I first tried that. Glad I did, though, the extra bit of fine shot is real handy on the odd clay target. Anyhow, fill that shell up until your overpowder wad is just below the casemouth. Top it off with a ten guage overshot was, glue in down with Duco Cement. I tried Emer's, my shot ran our everywhere I walked. Duco, everything stays in place.
Because the black powder is suposed to be compressed, what I did was put the overpowder wad in, then I put that same 7/16 socket in and whacked it a couple-three times with a plastic mallet, the same one I de and reprimed with.
It ain't real fast but, when I point my shotgun right, the knockdown targets fall. I do get plenty of smoke and fire too.