.400 Jeffery Nitro Express
| .400 Jeffery Nitro Express | ||||||||
|---|---|---|---|---|---|---|---|---|
Illustration from the 1938–1939 Westley Richards brochure | ||||||||
| Type | Rifle | |||||||
| Place of origin | United Kingdom | |||||||
| Production history | ||||||||
| Designer | W. J. Jeffery & Co. | |||||||
| Designed | 1896 | |||||||
| Produced | 1896–present | |||||||
| Specifications | ||||||||
| Parent case | .450/400 Black Powder Express | |||||||
| Case type | Rimmed, bottleneck | |||||||
| Bullet diameter | .410 in (10.4 mm) | |||||||
| Neck diameter | .440 in (11.2 mm) | |||||||
| Shoulder diameter | .520 in (13.2 mm) | |||||||
| Base diameter | .548 in (13.9 mm) | |||||||
| Rim diameter | .625 in (15.9 mm) | |||||||
| Rim thickness | .065 in (1.7 mm) | |||||||
| Case length | 3.00 in (76 mm) | |||||||
| Overall length | 3.75 in (95 mm) | |||||||
| Case capacity | 117.0 gr H2O (7.58 cm3) | |||||||
| Rifling twist | 1-15 in (381 mm) | |||||||
| Primer type | Boxer | |||||||
| Maximum pressure | 40,611 psi (280.00 MPa) | |||||||
| Ballistic performance | ||||||||
| ||||||||
| Test barrel length: 26 inches Source(s): Kynoch & Barnes. | ||||||||
The .400 Jeffery Nitro Express or .450/400 Nitro Express 3-inch is a medium bore, bottlenecked, Nitro Express cartridge designed by W. J. Jeffery & Co. in 1896, intended for use in single shot and double rifles.