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This is a non-diffusing subcategory of Category:Pistol and rifle cartridges. It includes Pistol and rifle cartridges that can also be found in the parent category, or in diffusing subcategories of the parent.
All 20 mm cartridges have an outside projectile diameter and barrel bore diameter of approximately 0.787 inches (20.0 mm). These projectiles are typically 75 to 127 mm (3–5 in) long, cartridge cases are typically 75 to 152 mm (3–6 in) long, and most are shells, with an explosive payload and detonating fuze.
The bore designations are only an approximate relationship to the actual weight of the projectile when it was applied to modern artillery. The table below lists the metric and Imperial calibres of various British weapons, which utilised the standard after 1919:
The Ordnance QF 20 pounder (known as 20 pounder, 20 pdr or simply 20-pr) was a British 84 mm (3.307 inch) tank gun. [ 1 ] [ i ] It was introduced in 1948 and used in the Centurion main battle tank, Charioteer medium tank, and Caernarvon Mark II heavy tank.
The 20-gauge shotgun, also known as 20 bore, is a type of smoothbore shotgun. 20-gauge shotguns have a bore diameter of .615 in (15.6 mm), while the 12-gauge has a bore diameter of .729 in (18.5 mm). [ 2 ] 12-gauge and 20-gauge shotguns are the most popular gauges in the United States .
In his African Rifles and Cartridges, John "Pondoro" Taylor wrote that the 8 bore and particularly the 10 bore ball and shot guns were popular as stand by backups to smaller calibre rifles for lion shooting. He states he used a paradox gun chiefly for shooting leopard, loading one barrel with a 750 gr solid lead bullet and the second with 1.25 ...
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British cartridges contained gunpowder until about 1892, and thereafter sticks of cordite bound together with an igniter pad, if necessary, in a cloth bag, usually silk. The "stick" nature of cordite gave the cartridges a degree of rigidity and hence they retained a tubular shape and could be handled and loaded as a solid unit even without a case.