I like to shoot a lot and I like to shoot black powder. I've found for me the cheapest way is to cast my own.
With a bucket full of wheel wieghts and a 6 cavity mould I can cast enough for 6 months or so of shooting in an afternoon. The only expense is the mould and bottom pour 20lb. melting pot. I figure I've saved enough in shooting supplies to pay for both. I should add that lube is also an expense, but I pan lube for black powder and that adds a little time and expense. For smokless tumble lubing with Alox is pretty effective, easy, fast, and cheap. I don't size since my moulds cast .453-.454 and that works great in all my 45 guns. I get the wheel weights free when I go to the dealership for servicing and have more than I can cast right now. I've found for cowboy loads wheel weights work great as cast, eigther in smokless or black powder. Only problem I have is finding pure lead for round ball and stuff, but even buying the lead is cheaper than ordering.
Hope this helps