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20 mm caliber is a specific size of popular autocannon ammunition. The dividing line between smaller-caliber weapons, commonly called " guns ", from larger-caliber " cannons " (e.g. machine gun vs. autocannon ), is conventionally taken to be the 20 mm round, the smallest caliber of autocannon.
Japanese 25×163mm ammunition from a post-war US technical manual A diagram of the M791 25×137mm round. Several sub-types of the NATO 25 mm ammunition are available—the most common being armor-piercing, high-explosive, sabot, tracer, and practice rounds. Cartridges are usually composed of a combination of the aforementioned categories. For ...
Hotchkiss 25 mm cannon France: World War II 25: Internal: Type 96 cannon Empire of Japan: World War II 25: External: M242 Bushmaster United States: Cold War 25: Internal: Oerlikon KBA Switzerland: Cold War 28: Internal: 1.1" autocannon United States: World War II 30: Internal: 30 mm Shipunov 2A42 Soviet Union: Cold War 30: Internal: 30 mm ...
Size comparison between 30×170mm and 5.56x45mm NATO. The 30 mm caliber is a range of autocannon ammunition. It includes the NATO standardized Swiss 30×173mm (STANAG 4624), the Soviet 30×155mmB, 30×165mm and 30×210mmB, the Czechoslovak 30×210mm, the Yugoslav 30×192mm, the British 30×113mmB, and the French 30×150mmB and 30×170mm cartridges.
Currently, HEI rounds are most commonly made in medium-caliber sizes of 20, 25, and 30 mm. They are fired from various platforms, including aircraft, anti-aircraft cannons , and anti-missile systems , as well as common battlefield howitzers , though the latter has gone through a recent decline in use.
An enhanced fire control system improves long-range accuracy to kill targets with fewer bursts, sometimes as few as two or three rounds instead of 10. The XM813 30 mm cannon is intended to replace the M242 Bushmaster 25 mm chain gun, and can be mounted on vehicles other than the Bradley. Two capabilities not demonstrated were its linkless ...
MG FF cannon - German 20mm aircraft cannon during early World War II. Developed from the Swiss Oerlikon FF. 2 cm KwK 30 - variant for armored cars and light tanks, slightly shortened barrel; 20 mm Polsten - Equivalent British 20mm anti-aircraft gun, developed from a Polish design which was, in turn, derived from a version of the Swiss Oerlikon.
During World War II, the German firm Mauser began development of a radically new 20 mm autocannon using a motorised firing mechanism in order to improve the rate of fire. The weapon was designed for 20mm mine shell rounds (designated the Mauser MG 213 and for 30mm rounds (the Mauser MK 213).