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Old 07-08-2010, 19:15   #3
_The_Shadow
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Location: Southeast, LoUiSiAna
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Yes the longer barrels allow the expanding powder gases to give a little more push for a little long resulting in the high velocities you are seeing.

LooK at the site for actual test done...http://www.ballisticsbytheinch.com/10mm.html
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