Shotgun Gauge Explained

The gauge refers indirectly to the bore or inside diameter of a shotgun. 20 gauge bore diameter? 16 gauge shotgun diameter? 12 gauge bore diameter?

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Shotgun “Gauge” explained. Why we call it a “12” gauge

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Shotgun “Gauge” explained. Why we call it a “12” gauge

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Shotgun “Gauge” explained. Why we call it a “12” gauge

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Shotgun Gauges Explained: 10 vs 12 vs 16 vs 20 vs 28 vs 410