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Green or blue projectile with brown nose and 1/4 black letters reading "High pressure test round" Cartridge, 20 mm, low pressure test, Mk 102 Mod 0 (USN) Not listed: 1700: Inert: Not listed: Green or blue projectile with brown nose and 1/4 black letters reading "Low pressure test round" Cartridge, 20 mm, high explosive incendiary, Mk 105 Mod 0 ...
The usual nomenclature of ammunition indicates the diameter of projectile and the length of the cartridge that holds it; for example, 20×102 mm is a 20 mm projectile in a 102 mm long case. Though this designation is often assumed to be unique, this is not always the case, e.g. there are three different 20×110 mm types which are not compatible.
The basic design was based on the original Oerlikon 20 mm cannon, in turn based on the German Empire's Becker 20 mm cannon of World War I. In the post-war period, Oerlikon had developed the original design to produce three autocannons with increasingly powerful rounds; the original model, later known as the "F", used the Becker 20x70mm round ...
5.45×39 mm Soviet: The Soviet adaptation of the 5.56×45 mm NATO round. 5.56×45 mm NATO: Adopted by the US military in the 1960s, it later became the NATO standard rifle round in the early 1980s, displacing the 7.62×51 mm. Remington later adopted this military round as the .223 Remington, a very popular round for small game hunting.
The Hispano fired a 130 grams (4.586 oz) 20 mm diameter projectile from a 110 mm (4.331 in) long casing, the whole round weighing 257 g (9.065 oz). [19] Lengths of the projectiles varied with type but were set to variable depth in the casing to produce a total full round length of 184 mm (7.244 in) regardless of projectile type. [ 20 ]
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[1]: 224 It was put into production by Denel Land Systems in two versions; 20 x 110 [2] [3] and 20 x 82. [4] The latter model is also available in 14.5 x 114 and conversion between the calibres can be done in the field by swapping the barrel and bolt assembly. The significantly larger 20 x 110 model cannot be converted to another calibre.
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