.450/400 Nitro Express

The .450/400 Nitro Express is a Nitro Express rifle cartridge that is produced in three case lengths: 238-inches, 3 inches and 314-inches, and is intended for use in single shot and double rifles. The 3-inch and 314-inch versions are considered classic Nitro Express cartridges.

.450/400 Nitro Express (314-inch)
.450/400 314 inch Nitro Express in a line up.
TypeRifle
Place of originUnited Kingdom
Production history
DesignerKynoch, Jeffery, and others
Designed1899
ManufacturerVarious
Produced1899–present
Specifications
Parent case.450/400 Black Powder Express
Case typeRimmed, 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 length3.25 in (83 mm)
Overall length3.85 in (98 mm)
Primer typeKynoch #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 & Barnes
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