I have 50 pounds of pretty much straight scrap lead, mostly lead pipe and roofing lead. I plan on casting some round balls with some of this but the rest of it I would be using for some 38 SPL and 45 ACP. What could I add to my lead that would bring the hardness up to about 10-11 BH? My pot is a 20# Lee Magnum melter and I'll be ladle casting.