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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.
The Anzio 20/50 has approximately 22,000 ft⋅lbf (30,000 J) of kinetic energy with an 800-grain (52 g) bullet. It does this by taking the .50 BMG projectile, which already is relatively large and travels extremely fast, and increases the already supersonic bullet to over 1.3 times its normal flight velocity, creating more kinetic energy ...
Developed as a pod for high-speed fighter aircraft which lacked a gun, this pod was fitted with a single M61A1 20 mm cannon and 1,200 rounds of ammunition. This weapon is powered by a ram-air turbine, and fires at a fixed rate of 6,000 rpm. However, for this firing rate to be achieved the aircraft needs to fly over 300 mph (480 km/h), and the ...
20: Internal: Becker Type M2 20 mm cannon German Empire: World War I 20: Internal: Nkm wz.38 FK Poland: Interwar 20: Internal: Polsten Poland: World War II 20: Internal: Berezin B-20 Soviet Union: World War II 20: Internal: ShVAK cannon Soviet Union: World War II 20: Internal: Ho-1 cannon Empire of Japan: World War II 20: Internal: Ho-3 cannon ...
The Oerlikon 20 mm cannon is a series of autocannons based on an original German Becker Type M2 20 mm cannon design that appeared very early in World War I. It was widely produced by Oerlikon Contraves and others, with various models employed by both Allied and Axis forces during World War II .
28 gauge — .550 in (14.0 mm) 24 gauge — .579 in (14.7 mm) 20 gauge — .615 in (15.6 mm) 16 gauge — .663 in (16.8 mm) 14 gauge — .693 in (17.6 mm) 12 gauge — .729 in (18.5 mm) 10 bore — .775 in (19.7 mm) 8 bore — .835 in (21.2 mm) 6 bore — .919 in (23.3 mm) 4 bore — 1.052 in (26.7 mm) 2 bore — 1.326 in (33.7 mm)
Each 14.5mm round weighs 2.2 ounces, compared to a 1.5 ounces for the .50 caliber round used by the Model 82. A typical hunting rifle has a rifle barrel 22 inches long, while the Model 82 has a ...
A numerically larger gauge indicates a smaller barrel: a 20-gauge (15.6 mm) shotgun requires more spheres to equal a pound; therefore, its barrel is smaller than the 12-gauge. This metric is used in Russia as "caliber number": e.g., "shotgun of the 12 caliber." The 16th caliber is known as "lordly" (Russian: барский).