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That is the diameter of the inside of the barrel- the smaller the number, the bigger the shell. Ignoring the .410 (which is NOT a guage)- guage was the number of round lead balls that could be made from one pound of lead that would fit the barrel. So a 20 g shotgun- 1 lb would make 20 balls. A 12 g, 1 pound would make 12 balls.

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12y ago

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