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Brinell hardness for 9mm bullets
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06-22-2012, 08:50 PM
mikld
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Join Date: May 2012
Location: S. Orygun
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Too hard and too small.
Too hard; bullet may not obturate/seal bore causing leading from gas bypass.
Too small; won't seal allowing gas to bypass and melt bullet causing leading.
Too hard or too small = barrel leading...
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