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 …

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 .

May 10, 2017 · The 20mm Hispano and the 20mm Oerlikon sometimes used the same projectiles, the cartridge cases were different. Weighing the projectile would also help with identification. Even minus filling and the driving band.

The Maschinengewehr (MG) 151 is a belt-fed autocannon for aircraft use, developed in Nazi Germany from 1934 to 1940 and produced by Waffenfabrik Mauser during World War II.

Widely used by many nations, this 20 mm automatic weapon originally designed by the Swiss firm of Oerlikon was probably produced in higher numbers than any other AA weapon of World War II.

Oct 28, 2017 · We’ll start with 20mm Hispano-Suiza cannon cartridges. A view of 3 cartridges found on various WW2 airbases. Ok. Let’s look at the headstamps. You can see they all follow the same pattern. A letter ‘code’ which represents the manufacturer, a date stamp and a calibre.

Jan 4, 2008 · Artillery shells and aircraft 20mm meant for aircraft use are probably best designed differently. The idea behind the German mine shell ( high filler to shell weight ratio ) was that most of the fragments from a bursting shell was provided by the structure being hit.

Recent story circulated on the web tells of a B-17 returning to base after a mission with 11 20mm unexploded shells in a fuel tank. Would the Germans have been using this gun against high altitude bombers?

Apr 17, 2013 · A third of Japanese aircraft shot down during WWII met their demise courtesy of the German designed, Swiss perfected, American built 20mm Oerlikon cannon.

Nov 27, 2017 · To eliminate the blinding flash characteristic of standard 20mm tracers fired at night, a special Dark Ignition tracer has been developed which does not light up until about 100 yards from the gun muzzle.