20×138mmB

20×138mmB

Three 20×138B cartridges and a 37 mm shell.
Type Anti-Armor/Anti-Air
Place of origin   Switzerland
Service history
Used by Switzerland, Germany, Italy, Finland, Poland
Wars World War II
Production history
Designed 1930
Manufacturer Swiss Solothurn
Variants Long Solothurn
Specifications
Case type Bottleneck, belted
Bullet diameter 20mm
Case length 137.4 mm
Ballistic performance
Bullet mass/type Velocity Energy
4.1 ounces (120 g) 2,950 feet per second (900 m/s) 34,655 ft·lbf (46,986 J) [1]

The 20×138mmB cartridge or Long Solothurn was a type of ammunition used mainly for anti-aircraft and anti-tank weapons during World War II. The designation means the caliber was 20 mm, the length of the cartridge case was 138 mm and B indicates it was a belted case. The loaded cartridge weighed 10.7 ounces (300 g).[1]

History

The 20×138mmB cartridge was initially created by the Swiss Solothurn company in the early 1930s.

Users

The 20×138mmB cartridge was used in the following weapons:

Switzerland

Germany

Italy

Finland

Poland

Wikimedia Commons has media related to 20 x 138mm.

References

  1. 1 2 Johnson, Melvin M., Jr. (1944). Rifles and Machine Guns. William Morrow and Company. p. 385.
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