"20mm" redirects here. For the model scale, see List of scale model sizes.
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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. All 20 mm cartridges have an outside projectile (bullet) 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.
Weapons using this caliber range from anti-materiel rifles and anti-tank rifles to aircraft autocannons and anti-aircraft guns.
20mmcaliber is a specific size of popular autocannon ammunition. The dividing line between smaller-caliber weapons, commonly called "guns", from larger-caliber...
The 30 mmcaliber is a range of autocannon ammunition. It includes the NATO standardized Swiss 30×173mm (STANAG 4624), the Soviet 30×155mmB, 30×165mm and...
25 mmcaliber is a range of autocannon ammunition. It includes the NATO standardized Swiss 25×137mm, the Swiss 25×184mm, the Soviet 25x218mmSR, and the...
23×260mm caliber, telescoped ammunition used on the Rikhter R-23 autocannon 12.7×99mm 12.7×108mm 14.5x114 20mmcaliber 25×137mm 40 mm grenade Bofors 40 mm gun...
155 mm (6.1 in) is a NATO-standard artillery shell caliber that is used in many field guns, howitzers, and gun-howitzers. It is defined in AOP-29 part...
Sharps, Winchester, and US Government cartridges are actually of 13 mmcaliber .50 caliber handguns Barnes, Frank C. (2006) [1965]. Skinner, Stan (ed.). Cartridges...
caliber range. Length refers to the empty cartridge case length OAL refers to the overall length of the loaded cartridge All measurements are in mm (in)...
bullets in the 11 millimetres (0.43 in) to 11.99 millimetres (0.472 in) caliber range. Length refers to the cartridge case length OAL refers to the overall...
433 in) caliber range. Length refers to the cartridge case length. OAL refers to the overall length of the cartridge. All measurements are in mm (in). ...
of firearm cartridges which have bullets in the 5.00 to 5.99 mm (0.197 to 0.236 in) caliber range. Length refers to the cartridge case length. OAL refers...
3146 in) caliber range. Length refers to the cartridge case length. OAL refers to the overall length of the cartridge. All measurements are in mm (in). Barnes...
firearm cartridges which have bullets that are 13 millimetres (0.51 in) caliber or larger. Length refers to the cartridge case length. OAL refers to the...
the cartridge Measurements are in millimeters then inches, i.e. mm (in). .25 caliber "6mm BR Norma" (PDF). C.I.P. 2015. Retrieved 2020-10-15. "6mm PPC...
mine shells for the 20mm MG-FF/M aircraft cannon, the design was rechambered to 20mmcaliber in 1941, using a newly developed 20×82mm cartridge which...
The M39 cannon is a 20mmcaliber single-barreled revolver cannon developed for the United States Air Force in the late 1940s. It was used on a number...
a 20mmcaliber cannon, known now as the 20mm Becker using the advanced primer ignition blowback (API blowback) method of operation. This used a 20×70mmRB...
40 mm (1.57 in) caliber. Several countries have developed or adopted grenade launchers in 40 mmcaliber. NATO currently uses three standardized 40 mm grenade...
small-caliber systems, which consists of four models: the Ultralight, the Inner Reloading and the Top with a 12.7 mmcaliber, and the 20 model with a 20mm...
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