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Old August 22, 2011, 01:59 PM   #5
Magnum Wheel Man
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Join Date: July 26, 2006
Location: Southern Minnesota
Posts: 9,333
my best guess with that charge & bullet weight, would be around 600 fps... + or - due to the looseness in the bore... if you get too much blow by, your results will be lower, if you get enough seal but less resistance, you may see more
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