backbored

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Gauge (bore diameter) — The Gauge or bore of a shotgun or rifle is a unit of measurement used to express the diameter of the barrel. The gauge or bore of a barrel is equal to the number of solid spheres of lead each having the same diameter as the inside of the barrel… … Wikipedia
Glossary of firearms terminology — The following are terms related to firearms and ammunition topics. A*accurize, accurizing: The process of altering a stock firearm to improve its accuracy. B*back bore, backbored barrel: A shotgun barrel whose internal diameter is greater than… … Wikipedia

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