(B) Three fired -22 rim- fire cartridge cases, each fired by a different rifle
(A) A High-grade double-barrelled hammerless Sporting Gun open ready for loading The arrow indicates the extractors Similarly smooth-bore muskets and guns were known by the weights of the bullets which they A cannon which fired a solid round shot of twelve pounds was described as a "Twelve Pounder," and so on for other sizes. This method of indicating the size of the bore is very old and dates back to the days of muzzle-loading cannon. For example, a 12-bore (or 12-gauge) is a weapon in which the bore is of such a size that twelve spherical lead bullets, each exactly fitting the bore, will together weigh one pound.
Spherical balls of pure lead, each exactly fitting the inside of the bore, which go to make up a pound. x.-Cross-section of a rifled barrel showing the grooves and lands. Large smooth-bores are measured by the number of Pig.
Gauge or Calibre-Both types of firearms are classified by the Gauge, or Calibre, of their bores that is by the internal dimension of the barrel A different system of measuring, however, exists for large smooth-bores and rifled arms. And those portions of the bore which are situated between the grooves are known as lands.
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