.450/400 Nitro Express

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.450/400 Nitro Express (31⁄4-inch)
.450/400 31⁄4 inch Nitro Express in a line up.
Type	Rifle
Place of origin	United Kingdom
Production history
Designer	Kynoch, Jeffery, and others
Designed	1899
Manufacturer	Various
Produced	1899–present
Specifications
Parent case	.450/400 Black Powder Express
Case type	Rimmed, bottleneck
Bullet diameter	.405 in (10.3 mm)
Neck diameter	.432 in (11.0 mm)
Shoulder diameter	.502 in (12.8 mm)
Base diameter	.544 in (13.8 mm)
Rim diameter	.614 in (15.6 mm)
Rim thickness	.042 in (1.1 mm)
Case length	3.25 in (83 mm)
Overall length	3.85 in (98 mm)
Primer type	Kynoch #40
Ballistic performance
Bullet mass/type Velocity Energy 400 gr (26 g) 2,150 ft/s (660 m/s) 4,110 ft⋅lbf (5,570 J)
Test barrel length: 26 inches Source(s): Kynoch[1] & Barnes[2]

The .450/400 Nitro Express is a Nitro Express rifle cartridge that is produced in three case lengths: 23⁄8-inches, 3 inches and 31⁄4-inches,^[2] and is intended for use in single shot and double rifles. The 3-inch and 31⁄4-inch versions are considered classic Nitro Express cartridges.