i took a large load of steel to the scrap yard to cash in to buy lead. Normally i get ww but to guy said he had some good stuff so i followed him. He had 28 lbs of 45 acp rn 230 grain, perfectly cast for a dollar a pound and he had a 80 lb block that was cast in a cake pan. It had a good ring and seemed hard, so i bought it. I got home to melt it down and and it was cold outside (30) and i was having a hard time keeping the large pot up to temp. I melted it all down to put in a muffin pan and all seemed normal. It was grainy which i had seen before when you just barely up to temp, but when i put it in the muffin pan it seem to take forever for the center to harden and it formed a hole in the center. I don't think it had zinc in it because it did not have the scum on top but who knows. the lead is a little softer than ww but not much.
the new lead stayed shiny also, but the left one is the new lead, center is ww, and the right is pure.
what do you think, zinc, tin, cold?
thanks