I started casting bullets in 1968, feeding a Navy Arms .58 Buffalo Hunter (a sawed off Zouave, cool little rifle) with hand-made sand molds...didn't work too well. In about '72, got my hands on a T/C Hawken, .50, and for many years that was my primary gun. Killed my first deer with it, and balls cast in the kitchen with the T/C mold that came with the gun. Had a little tin frying pan to melt lead over the gas stove. Got my lead from a guy a hour's horse ride away for $0.50/lb in five pound ingots. I'd chop off chunks with an axe to melt, hehehe (hadn't thought of that little bit in a long long time). Got my powder from him, too, a dollar a pound of what he claimed was reclaimed powder from surplus US 45/70 ammo. It was brown, soft, large-grained, and, to date, the cleanest and most accurate black powder I've ever used. These days, when I need bullets (for me, casting/reloading has always been about the having what your gun needs, and if you don't have it, make some, philosophy). These days, I use a bottom-pour pot and aluminum gang (five/six cavity) molds from Lee, NOE, and Arsenal ( I just got the Arsenal one last week, a .315 130gr Keith SWC for .327 Federal. Haven't tried it out yet, but it is gorgeous). Also have steel molds from RCBS, Lyman, some home-made ones (that turned out a lot better than those sand casts), round ball, Mini-ball, Maxi ball, .75 ball (for the Little Napoleon), 1.0" elongated ball (for the Columbiad), 1.68" (one pounder, for a future varmint gun, golf ball sized), and of course the two pounder mold, 2 1/8" for the Bigger Napoleon.
Should you dare to take the leap into casting, be aware...one day you will find yourself down range, scarfing up spent rounds muttering "Darn, the copper"; raiding your tackle box for lead; wondering if your home is old enough to have lead pipes; walking with your head down, sniping errant wheel weights in the streets (I have cans and buckets full of rendered wheel weights in ingots, disguised as holding-down-the-tarp-on-the-roof weights), pocketing them after a critical estimate of bullets, given any particular weight; you find their your math skills have improved immensely.
All in all, I think it's a pretty good deal.