Reloading your own 45-70s is about the only way to go unless you literally have money to burn. I'm too lazy to cast my own bullets, so I buy pre-cast 500 grain Lymans, melt the smokeless lube out and re-lube them with SPG for black powder to shoot from my Sharps. I figure they're probably running me about 50 cents each using Swiss black powder (which is expensive at about $25 per pound). There is something about making them that's actually kind of fun though and it's usually a task that I look forward to as recreation. I also look forward to the flames coming out of the barrel, the big cloud of smoke and that deep boom.