7×20mm Nambu | ||||||||
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Type | Pistol | |||||||
Place of origin | Japan | |||||||
Service history | ||||||||
In service | 1903–1945 | |||||||
Used by | Japan | |||||||
Wars | World War II | |||||||
Production history | ||||||||
Designer | Kijiro Nambu | |||||||
Designed | 1902 | |||||||
Manufacturer | Type B Nambu Pistol 1. Tokyo Artillery Arsenal, Koishigawa, Tokyo 1903–1923 and 2. Tokyo Gas and Electric Co., Ltd., Tokyo 1923–1929. Was ammunition made in the same factories? | |||||||
No. built | Pistols - Possibly less than 6,500. 1. Tokyo c. 5,900 and 2. TGE c. 550. Number of 7×20mm rounds made is unknown but today they are a quite rare collector's item occasionally found in WW2 boxes of 50 rounds. | |||||||
Variants | At least 5, including a dummy. Variations mainly occur in type of bullet crimping, jacket type and rim thickness. | |||||||
Specifications | ||||||||
Case type | Bottleneck rimless | |||||||
Bullet diameter | 7.08 mm (0.279 in) | |||||||
Neck diameter | 7.64 mm (0.301 in) | |||||||
Shoulder diameter | 8.62 mm (0.339 in) | |||||||
Base diameter | 8.91 mm (0.351 in) | |||||||
Rim diameter | 9.11 mm (0.359 in) | |||||||
Rim thickness | 0.98 mm (0.039 in) | |||||||
Case length | 19.80 mm (0.780 in) | |||||||
Overall length | 26.80 mm (1.055 in) | |||||||
Primer type | Small pistol | |||||||
Ballistic performance | ||||||||
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Test barrel length: 83 mm (3.25 in) |
The 7×20mm Nambu is a rimless, bottleneck handgun cartridge designed in Japan for use in the Type B or "Baby" model Nambu pistol. [1] The cartridge is a scaled-down version of the 8×22mm Nambu used in all other Nambu pistol models. It has a muzzle energy greater than that of the .25 ACP and closer to the .32 ACP. [2] [3] [4]