Rounds, Ammunition

The 20 mm calibre shell is a specific size of popular autocannon ammunition. It is typically used to distinguish smaller-calibre weapons, commonly called “guns”, from larger-calibre weapons such as “cannons” (e.g. a machine gun vs. an autocannon).

All 20 mm cartridges have an outside projectile (bullet) diameter and barrel bore diameter of 0.787 inches (20.0 mm). Weapons using this calibre range from anti-materiel rifles and anti-tank rifles to aircraft autocannons and anti-aircraft guns. They have targets such as vehicles, buildings, or aircraft.

The 25 mm calibre is a specific size of popular autocannon ammunition. Such ammunition includes the NATO-standard 25×137mm and 25×184mm.

Rounds, Ammunition  - image1The 25 mm round may be used in both an anti-materiel and anti-personnel role. When operating in the anti-personnel role, a 25 mm weapon armed with high explosive (HE) rounds can effectively kill large numbers of opposing troops either in the open or in light fortifications. When operating in the anti-materiel role, a 25 mm weapon with armor-piercing (AP) rounds can disable aircraft and vehicles, including main battle tanks.

On the left is a 25mm shell, The 20 mm shows “20mm 1945

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