A friend of mine gave me #60 of lead in the form of plumbers lead/sticks. About 1/2 of it was marked pure lead. #10 of it was sticks of 50/50. There was about #20 of unmarked sticks. They bent/twisted up real easy so I figured they were pure lead also. I fired up the pot and cast sinkers and split shot out of them. Figured I'd restock the fishing weights. I water drop the split shot and egg sinkers when I cast them. Keeps them from de-forming when they're dropped from the molds. I got done casting everything and pulled it from the water to let everything dry. A couple days later I tested the split shot and found it was hard, actually to hard. The only thing I have to test lead with is a set of pencils. Turns out the unmarked sticks are 10bhn/20 to 1 lead/tin (b3 pencil).
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Glad I caught that one, the #20 of 5% tin will get used up this year.