I belong to a club with indoor facilities, 10 firing points, with mostly bullseye shooting. We would love for somebody to help themselves to all of the range lead they want. I'm probably the only caster of the 100 or so members, so I don't put a very big dent in the lead supply. I use straight range lead for most of my bullets, (they're coming out at about 12 on the hardness scale).
If there's a range close by, check it out, you might be able to get all the lead you want for free.
R.M.