Source: wikibot/gauge-firearms
= Gauge (firearms)
{wiki=Gauge_(firearms)}
In firearms terminology, "gauge" refers to a measurement that indicates the bore diameter of shotgun barrels. It is a standard used to categorize and describe shotguns, with the gauge number reflecting the size of the projectile used. The gauge number is derived from a historical method of measurement: it is the number of lead balls of a specific diameter that would weigh one pound.