I just picked up a Maxi-Ball bullet mold on Ebay for my .50 Hawken flintlock. In looking at lead ingots on Ebay I see many are cast from old wheel weights. Sometimes the description will say the impurities have been skimmed off, sometimes it is not specified. My question: is melted down wheel weight lead soft enough to be used for cast muzzleloader bullets? I understand a person wants to use pure, soft lead for muzzleloader bullets so I'm wondering if that's what you usually get from wheel weights or if that lead tends to be hardened by other metals being added. Thanks for any help!