Gauge Shotgun

Some articles on shotgun, gauge, shotguns, gauge shotgun:

Shotgun Shell - Shotshell Sizes
... Shotgun shells are generally measured by "gauge", though in Britain and some other locations outside the United States the term "bore" is used with the same meaning ... By contrast, shotguns are usually measured by "gauge", which is the weight, in fractions of a pound, of a pure lead round ball that is the same diameter ... For example, a shotgun is called 12-gauge because a lead sphere that just fits the inside diameter of the barrel weighs ⅟12 of a pound ...
Caliber - Shotguns
... Shotguns are classed according to gauge, a related expression ... The gauge of a shotgun refers to how many lead spheres the diameter of the bore would equal a pound ... In the case of a 12-gauge shotgun, it would take twelve spheres the size of the shotgun's bore to equal a pound ...
20-gauge Shotgun
... The 20-gauge shotgun is a type of smoothbore shotgun that is smaller in caliber (.615) than a 12 gauge (.729) ... It takes 20 lead balls of the diameter of a 20-gauge shotgun bore to equal 1 pound, while it only takes 12 lead balls of the diameter of a 12-gauge shotgun bore to equal the same amount ... A 20-gauge shotgun is sometimes considered more suitable for hunting certain types of game, because it damages less meat, which makes it suitable for most game birds ...