I have just started casting round balls for my muzzle loading rifles. The question I have is if I put non-pure lead in my pot, will the non-lead material float to the surface of the pot to be skimmed off leaving only pure lead? The reason I ask, is I have access to several hundred pounds of miscellaneous pistol lead bullets that are being cleaned out of the indoor range bullet traps of my club. I only want to cast pure lead round balls for my muzzle loaders and was hoping I could use this lead if it can be separated into pure lead.