A shotguns gauge is a measure related to the diameter of the smooth shotgun bore and the size of the shotshell designed for that bore.
Gauge or diameter of the bore is determined by the diameter of 1 lead pellet times the number of pellets required to equal 1 pound. ex. 12 gauge is equal to the diameter of 1 of the 12 lead balls that equals 1 pound. ex. 20 gauge is equal to the diameter of 1 of 20 lead balls that equals 1 pound. ex. 3 gauge is equal to the diameter of 1 of the 3 lead balls that equals one pound. The larger number of gauge the smaller the bore.
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