| 7×20mm Nambu | |
| Origin: | Japan |
| Type: | Pistol |
| Service: | 1903–1945 |
| Used By: | Japan |
| Wars: | World War II |
| Designer: | Kijiro Nambu |
| Design Date: | 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? |
| Number: | 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. |
| Is Si Specs: | yes |
| Case Type: | Bottleneck rimless |
| Bullet: | 7.08 |
| Neck: | 7.64 |
| Shoulder: | 8.62 |
| Base: | 8.91 |
| Rim Dia: | 9.11 |
| Rim Thick: | 0.98 |
| Case Length: | 19.80 |
| Length: | 26.80 |
| Primer: | Small pistol |
| Is Si Ballistics: | yes |
| Bw1: | 56 |
| Btype1: | FMJ |
| Vel1: | 240 |
| En1: | 108 |
| 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]