I get my weights from a shop that builds hot rod trucks with huge wheels and the occasional car. While I get some zinc weights most is either lead or steel. Following instructions I got here i start but running a magnet over everything that comes out of the bucket. Anything that sticks goes in a steel scrap bucket the rest is lead or zinc, all of that gets the side cutter test. After a few buckets you will get to recognize the stick on lead from stick on steel. It was overwhelming the first time I tried as I was unsure of what was what and wanted to get some good bullets.