Thus, if eight lead balls of bore diameter added up to one pound, the shotgun was designated an eight-gauge gun. The gauge of a shotgun originally was expressed as the number of round lead balls of bore diameter necessary to make a total weight of one pound. The measurement of the bore in shotguns is expressed in terms of gauge. In comparing the two systems, a rifle or pistol with a calibre of 7.62 mm corresponds to one of calibre. The use of this system allowed NATO weapons of various makes and national origins to use ammunition of standardized size. In the armed forces of both Britain and the United States, however, the trend since 1950 has been to follow the metric system, in which millimetres and occasionally centimetres are the units of measurement. 303 Lee-Enfield rifle, which was widely used in both World Wars. In Great Britain it has been common practice to carry the figure to another decimal point, as in the calibre. 30-calibre rifle is 30/ 100 of an inch, and that of a. system, calibre (or caliber) is measured in inches for cannons and hundredths of an inch for small guns. (The term “ calibre” also designates the outside diameter of the projectile or ammunition used in the gun.) In these weapons, the calibre is normally obtained by measuring between the faces of opposite lands ( i.e., the ridges between the grooves in the barrel). In guns that have rifled barrels, e.g., rifles, pistols, machine guns, and artillery or naval guns, the diameter of the bore is termed the calibre. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!īore, in weaponry, the interior of the barrel of a gun or firearm.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.
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