.255 Jeffery Rook

.255 Jeffery Rook
Type	Rifle
Place of origin	United Kingdom
Production history
Designer	W.J. Jeffery & Co
Specifications
Case type	Rimmed, bottleneck
Bullet diameter	.255 in (6.5 mm)
Shoulder diameter	.274 in (7.0 mm)
Base diameter	.344 in (8.7 mm)
Rim diameter	.401 in (10.2 mm)
Case length	1.15 in (29 mm)
Overall length	1.43 in (36 mm)
Ballistic performance
Bullet mass/type Velocity Energy 65 gr (4 g) 1,200 ft/s (370 m/s) 208 ft·lbf (282 J)
Source(s): Cartridges of the World.[1]

The .255 Jeffery Rook, also known as the .255 Jeffery Rook Rifle, is an obsolete centerfire rifle cartridge developed by W.J. Jeffery & Co.

Overview

The .255 Jeffery Rook is a rimmed cartridge originally designed for use in rook rifles for hunting small game and target shooting. The .255 Jeffery Rook gained an excellent reputation for accuracy, it was widely used for target shooting before being superseded by the .22 Long Rifle as a miniature target round.^[2]

It was loaded with both black powder and smokeless powders, usually with a 65 gr (4.2 g) lead solid or hollowpoint bullet at a standard muzzle velocity of 1,200 ft/s (370 m/s).^[1]

See also

• List of rifle cartridges
• 6 mm rifle cartridges

References

Footnotes

Bibliography

• Barnes, Frank C., Cartridges of the World, 15th ed, Gun Digest Books, Iola, 2016, ISBN 978-1-4402-4642-5.
• Imperial War Museums, ".255 Jeffery rook rifle", iwm.org.uk, retrieved 18 April 2017.
• Municon, ".246 Purdey Nitro Express", municion.org, retrieved 18 April 2017.

External links

• Cartridgecollector, ".255 Jeffery Rook", cartridgecollector.net, retrieved 18 April 2017.