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Old December 21, 2012, 11:08 AM   #9
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Join Date: October 25, 2010
Location: New Mexico
Posts: 853
You'll want an interference fit on the round, basically. It creates a seal against the barrel "walls" so the gas isn't blowing around the bullet when the round is fired. That's why it's possible, when reloading, to load a round too light and get a bullet stuck in the barrel.
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