Several years ago, I was interested in trying the same thing that you are now, and I had a fellow, placing an order with Dixie, order me a simple mold for 50 caliber round ball. The darn thing looked like a big pair of tin snips, made out of rough cast-iron or cast steel. It took several years before I got Interested in using this crude looking mold, so I chopped the handles off, ground the stems round so they would fit a piece of wood. Tried it at home, and the darned mold worked real good. Made nice balls. No sprue cutter, but an old pair of dikes were good to nip off the sprue. Of course I waited till I was too old to pursue my desire to just field trek.
Equipment required was not very much, A big old soup spoon with the handle cut down, would work for a ladle and not be too heavy. Now if I was looking for some lead, I'd go to any tire shop and get a few wheel weights, and cut them up with a hack saw or something and use those for lead. Wheel weights are the hardest form of lead I have ever tested besides printer's lead, but they work real fine for round balls. Be sure the wheel weights are not zinc, though I have never run across any but I know they are made. If I was younger, I would take this stuff and go hunting for deer, or just trekking, sleep outside, and cook over a nice wood fire, cast a few round balls, And perhaps hunt just a little. but I'm over 80 and it ain't going to happen. If you can do it, do it when you can.
Squint