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The outside dimension of a barrel is simply the diameter.

The traditional inside measurement of a rifled barrel is caliber and the traditional inside measurement of a smoothbore (shotgun) barrel is gauge.

Strictly speaking, smoothbore gauges are not diameters. Gauge number is the number of round balls fitting the bore that can be made from a pound of lead.

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14y ago

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Q: What is the diameter of a gun barrel known as?
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