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 …

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20mm caliber cartridges have an outside shell diameter and inside barrel diameter of 0.79 inches (20 mm). Projectiles or shells are typically 75 to 127 mm (3–5 in) long. Cartridges are typically 75 to 152 mm (3–6 in) long. Many but not all 20mm shells …

Feb 18, 2024 · A 20mm shell has a caliber of 20mm, which is the diameter of the projectile or the bore diameter of the gun that fires it. What is the purpose of a 20mm shell? A 20mm shell is primarily used in military applications for anti-aircraft, anti-vehicle, and anti-personnel purposes.

The 20mm MK149 Armor-Piercing Discarding Sabot cartridge provides a significant anti-armor capability with optimized ballistic performance and short time-of-flight to target. Compatible with the NAVY’s PHALANX Anti-Ship Missile Defense System and the M61 and M197 gun systems.

The Rheinmetall Mk 20 Rh-202 (short for Maschinenkanone 20 mm Rheinmetall) is a 20 mm caliber autocannon designed and produced by Rheinmetall. It fires the 20×139mm ammunition originally developed for the Hispano-Suiza HS.820.

Aug 20, 2023 · The 20 mm shell, with its imposing size, may raise questions regarding its caliber and potential applications. This article aims to provide a concise and informative overview of the caliber of a 20 mm shell, shedding light on its characteristics, …

Nov 10, 1998 · Twenty-millimeter ammunition is the ammo used on the M197 automatic gun. The rounds are electrically primed; chamber pressure varies from 60,500 to 61,500 psi. Projectile weight of the M56 HEI round is 1,543 grains (3.5 ounces); other 20-mm projectiles are of comparable weight.

Feb 18, 2024 · The 20mm caliber is typically used in heavy weapons such as aircraft cannons, anti-aircraft guns, and naval artillery. Its high muzzle energy and velocity make it suitable for piercing heavily armored targets and delivering devastating firepower.

Feb 17, 2024 · What caliber is a 20mm? A 20mm caliber refers to the diameter of the projectile or the bore of the barrel in a firearm. In general, a 20mm caliber firearm is considered a large caliber weapon. What is the difference between caliber and millimeter?