I've had that before and haven't a clue what caused it. I was told too much antimony, too hot, yada yada.
I added it to my pot one ingot at a time with some that was almost pure Pb, once stirred in with a chunk of paraffin I noticed nothing unusual with the bullets poured. I did however relegate those batches to target type bullets for the 38 and 45acp.
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LAter,
Mike / TX
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