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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 cartridges were intended to be aid to anti-Communist insurgents and Allied forces equipped with US weapons. They were loaded in 5-round stripper clips in M1 bandoleers (holding 6 × 5-round clips in cardboard spacers, or 60 rounds each) packed in US Navy 20mm Mark 1 metal ammo chests (33 × 60-round bandoleers; or 1980 rounds each).
The 20mm Ammunition Box Mk.1 Mod.0 (1942-1970s?) was a steel chest used by the Navy that was originally designed to carry 20mm shells. It had a removable lid with a gasket seal, two large hasps on each side and a hasp on each end, and was painted gray with black markings.
A 7.62×51mm NATO crimped blank cartridge. The appearance of a blank cartridge can give a false sense of safety. Although blank cartridges do not contain a bullet, precautions are still required because fatalities and severe injuries have resulted on occasions when blank cartridges have been fired at very close ranges.
A training round, practice rocket was available for Blindicide. This used a blank 20 mm cartridge to produce a flash and a bang, but the round fell only a few feet in front of the launcher. A 20 mm Sub-caliber training round was also available. This had a rifled barrel and fired either a plastic or copper projectile.
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Aimo Lahti had doubts about the original idea of a 13 mm anti-tank machine gun and started working on a 20 mm design. Officers who wanted smaller caliber anti-tank weapons believed that the muzzle velocities of 20 mm shells were insufficient to penetrate armor, and a weapon with a higher rate of fire and in a smaller caliber would prove useful ...
The 20×110mm USN (also known as 20×110mm US Navy and 20mm Mk-100 Series) is an autocannon cartridge developed by the US Navy after World War II for use in Mk 11 and Mk 12 autocannons. They are called the Mk 100 series as they range from Mk 101 to Mk 109.