Three 20×138B cartridges and a 37 mm shell.
|Place of origin||Switzerland|
|Used by||Switzerland, Germany, Italy, Finland, Poland|
|Wars||World War II|
|Case type||Bottleneck, belted|
|Case length||137.4 mm|
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).
The 20×138mmB cartridge was initially created by the Swiss Solothurn company in the early 1930s.
The 20×138mmB cartridge was used in the following weapons:
- FlaK 30 and FlaK 38 single-barrel, and Flakvierling quadruple-barrel anti-aircraft guns
- KwK 30 and KwK 38 vehicle-mounted weapons
- MG C/30L aircraft gun
- anti-aircraft guns: Cannone-Mitragliera da 20/65 modello 35 (Breda) and Cannone-Mitragliera da 20/77 (Scotti)
- Nkm wz.38 FK anti-tank vehicle mounted gun
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- Johnson, Melvin M., Jr. (1944). Rifles and Machine Guns. William Morrow and Company. p. 385.