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Good write up Larry – bjornb, Walt at NEI long ago explained to me the Aluminum and Brass having different expansion properties when heating up will make a difference in the dropped from the same design unless the mold maker takes it into consideration – He was a smart guy – I was ordering two cavity molds of different designs and sometimes he’d say nope don’t do that as the cavity wasn’t big enough to get the bullets to correctly heat the block to match the other side with a larger cavity.  I really wish I had been smarter and pumped him for more knowledge back then.

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