![]() The term is related to the measurement of cannon, which were also measured by the weight of their iron round shot an 8-pounder would fire an 8 lb (3.6 kg) ball. Thus there are twelve 12-gauge balls per pound, etc. Gauge is determined from the weight of a solid sphere of lead that will fit the bore of the firearm and is expressed as the multiplicative inverse of the sphere's weight as a fraction of a pound, e.g., a one-twelfth pound lead ball fits a 12-gauge bore. ![]() The gauge (or commonly bore in British English) of a firearm is a unit of measurement used to express the inner diameter (bore diameter) of the barrel. 410 bore shotshell, a 20-gauge shotshell, and a 12-gauge shotshell
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