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It is an indication of the diameter of the inside of the barrel. The larger the number, the smaller the diameter. It works like this: the number is how many balls that size make up one pound of lead, so a 20 gauge barrel is the diameter of a ball, 20 of which would make up one pound. 12 gauge is the size ball that 12 balls would make one pound. This is correct except for .410, which is the actual bore size of 41/100".

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17y ago

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