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I'm pretty new to casting myself, but so far I have found it quite enjoyable. I have not been fortunate enough to get my hands on any wheel weights, but I've come across a few other random piles of lead. What I like to do is to smelt my raw materials into clean ingots. I test the hardness of the ingot batches (not each ingot, but a few samples from each batch) and I write the BHN number on the batches (I'm using a Lee hardness tester). When I want to run with a specific BHN number I can mix up what I need to get the desired hardness. Also, I use a bottom pour Lee pot for casting and I really only want clean lead in that pot.
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