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Gauge: Definition: A measurement of the diameter of a shotgun barrel, based on the number of lead balls of that diameter that make up one pound. Common Gauges: 12 Gauge: The most popular shotgun gauge, used for hunting, home defense, and sport shooting. 20 Gauge: A lighter alternative to the 12 gauge, often used by smaller-framed shooters or for hunting smaller game. .410 Bore: Not a gauge but a caliber, the .410 is a small shotgun shell used for small game hunting and...