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2. 20 mm caliber - Wikipedia

   en.wikipedia.org/wiki/20_mm_caliber

   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.

3. Hispano-Suiza HS.820 - Wikipedia

   en.wikipedia.org/wiki/Hispano-Suiza_HS.820

   The HS.639-B3 (later known as the GAI-CO1) is a single-gun mounting fed from a 75-round drum, a fairly serious limitation for a gun with such a high rate of fire. Variants included the HS.639-B4 ( GAI-CO3 ) with a 50-round drum mounted on top of the weapon, and the HS.639-B5 ( GAI-CO6 ) that uses dual 75-round magazines for longer firing times.

4. Rheinmetall Mk 20 Rh-202 - Wikipedia

   en.wikipedia.org/wiki/Rheinmetall_Mk_20_Rh-202

   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.

5. Hispano-Suiza HS.404 - Wikipedia

   en.wikipedia.org/wiki/Hispano-Suiza_HS.404

   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 ]

6. m/40 automatic cannon - Wikipedia

   en.wikipedia.org/wiki/M/40_automatic_cannon

   A 20×145mmR cartridge, as would be used in the m/40, tape measure in centimeters for scale. The 20 mm m/40 followed the same pattern of long-recoil operation as the 25 mm and 40 mm guns. It was chambered for a unique and quite powerful 20×145R cartridge, and could fire at 360 rpm.

7. List of autocannon - Wikipedia

   en.wikipedia.org/wiki/List_of_autocannon

   Bofors 40 mm gun L/60 Sweden: World War II 40: Internal: Bofors 40 mm gun L/70 Sweden: Cold War 40: Internal: Ho-301 cannon Empire of Japan: World War II 40: Internal: QF 2-pounder pom-pom United Kingdom: World War I 40: Internal: Vickers S gun United Kingdom: World War II 40: Internal: Otobreda Fast Forty Italy: Cold War 40: External ...