.450 Adams

The topic of this article may not meet Wikipedia's notability guidelines for products and services. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted. Find sources: ".450 Adams" – news · newspapers · books · scholar · JSTOR (June 2023) (Learn how and when to remove this message)

.450 Adams
.450 Adams cartridge
Type	Revolver
Place of origin	United Kingdom
Service history
In service	1868–1880
Used by	British military, North-West Mounted Police, colonial military, police forces
Production history
Designed	1868
Specifications
Case type	rimmed straight
Bullet diameter	.455 in (11.6 mm)
Neck diameter	.475 in (12.1 mm)
Base diameter	.477 in (12.1 mm)
Rim diameter	.510 in (13.0 mm)
Case length	.69 in (18 mm)
Overall length	1.10 in (28 mm)
Rifling twist	1:16 in (410 mm)
Primer type	boxer
Ballistic performance
Bullet mass/type Velocity Energy 225 gr (15 g) ball (Kynoch black powder) 650 ft/s (200 m/s) 211 ft⋅lbf (286 J) 225 gr (15 g) ball (Kynoch smokeless powder) 700 ft/s (210 m/s) 245 ft⋅lbf (332 J)
Source(s): Barnes & Amber 1972

The .450 Adams was a British black powder centrefire revolver cartridge, initially used in converted Beaumont–Adams revolvers, in the late 1860s.^[1] Officially designated .450 Boxer Mk I, and also known variously as the .450 Revolver, .450 Colt, .450 Short, .450 Corto, and .450 Mark III, and in America as the .45 Webley,^[2] it was the British Army's first centrefire revolver round.^[2]