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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.
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 ]
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. All 20 mm cartridges have an outside projectile diameter and barrel bore diameter of approximately 0.787 inches (20.0 mm). These projectiles are typically 75 ...
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 ...
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 .
Also, its length and weight made portability difficult, so a two-wheeled split-trail carriage was provided. Once towed into position the gun could be fired from the carriage or dismounted and fired from a bipod for the anti-tank role. In the anti-tank role, it was able to penetrate 15–18 mm (0.59–0.71 in) at 300 m (330 yd) (30°). [2]
The RT-20 is a Croatian bullpup anti-materiel rifle developed by Metallic in Rijeka in the mid-1990s and marketed by RH-Alan. [1] [2] The name itself is an acronym of the Croatian word Ručni Top 20, or "Hand Cannon 20mm".
JSP is a semi-jacketed round as the jacket does not extend to the tip Various hollow points: .45 Auto, .38 Special, .44 S&W Special, .44 Remington Magnum.45 ACP Federal HST 230gr hollow point cartridge, with two rounds of CCI Standard Velocity .22 LR for comparison purposes.40 S&W round, complete cartridge and expanded bullet A 9mm hollow point ...