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The gauge system of sizing shotgun barrels is an old one. It refers to the number of round lead balls in a pound that will fit the inside of the barrel. A 12 gauge shotgun has a barrel that is the size of a round lead ball that is 1/12th of a pound. A 10 gauge, 1/10th of a pound, 16 g, 1/16th of a pound, and so one. The SMALLER the gauge, the larger the barrel. You should note that the .410 is NOT a gauge, but an actual measurement.

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15y ago

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