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If they are both 70/30 I can't see where there would be a difference. I did run into a bad batch years ago though-everything that was done in the shop with that lead later popped-impurities we figured at the time. Maybe your friend had the same thing happen with the rectangular bars he had? Years ago you could buy both 70/30 and also 80/20 but I don't see the 80/20 offered anywhere.
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