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Old April 10, 2005, 11:00 PM   #2
Senior Member
Join Date: June 10, 2004
Location: Tioga co. PA
Posts: 2,526
lead vs copper

copper is harder thus it resist being transformed to match the grooves and barrel diameter. It takes more energy to push it down the barrel. with the same powder charge it will develop more pressure due to this effect and be slower comming out.
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