.22 CB

From Wikipedia, the free encyclopedia

A .22 CB cap, .22 short, and .22 Long Rifle
Type	rimfire, target
Place of origin	USA
Production history
Produced	1888
Specifications
Parent case	.22 BB
Bullet diameter	.222 in (5.6 mm)
Neck diameter	.225 in (5.7 mm)
Base diameter	.225 in (5.7 mm)
Rim diameter	.271 in (6.9 mm)
Rim thickness	.040 in (1.0 mm)
Case length	.420 in (10.7 mm)
Overall length	.520 in (13.2 mm)
Primer type	Rimfire
Ballistic performance
Bullet weight/type	Velocity	Energy
29 gr (1.9 g) RN	727 ft/s (222 m/s)	33 ft·lbf (45 J)
30 gr (1.9 g) RN	725 ft/s (221 m/s)	34 ft·lbf (46 J)
Source(s): Cartridges of the World, 11th Edition[1]

.22 CB Cap (Conical Ball Cap, known as a 6mm Flobert in Europe) is a variety of .22 caliber rimfire ammunition which has a very small propellant charge (usually no gunpowder, just the primer), resulting in a low muzzle velocity of between 350 and 700 ft/s (110 to 210 m/s).^[2] This is similar to the muzzle velocity produced by a low to mid-power .22 pellet gun, however the bullet from a .22 CB cartridge is significantly heavier than a typical airgun pellet and therefore carries more energy. Due to their low power, CB rounds can be trapped by most pellet gun traps. In longer rifle barrels the CB has a very quiet, seemingly non-existent report due to the lack of residual pressure at the muzzle (see Internal ballistics).
The original .22 CB cartridge has the same case as the .22 BB, but there are now low-power .22 rounds sold as .22 CB Short and .22 CB Long which come in the more common .22 rimfire cartridge cases. The longer cases will allow the rounds to be fired in magazine fed firearms, in which the tiny CB Cap cases would jam. So while having the same length, the modern .22 CB Short and the .22 Short are two different cartridges. The CB has a reduced powder load and is kept (as mentioned above) between 350 and 700 ft/s, while the Short with an increased powder amount launches the same 29gr bullet around and above 1000 ft/s.

Specifications

• Case length:
  • Cap: 0.284 in (7.2 mm)
  • Short: 0.423 in (10.7 mm)
  • Long: 0.595 in (15.1 mm)
• Bullet weight:
  • typically 20 to 29 grains (1.30 to 1.88 g)

References

1. ^ Cartridges of the World 11th Edition, Book by Frank C. Barnes, Edited by Stan Skinner, Gun Digest Books, 2006, ISBN 0-89689-297-2 pp. 490, 492
2. ^ Cartridges of the World 11th Edition, Book by Frank C. Barnes, Edited by Stan Skinner, Gun Digest Books, 2006, ISBN 0-89689-297-2 p. 476

• This page was last modified on 14 December 2010 at 20:03.
• Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. See Terms of Use for details.
  Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.
• Contact us

• Privacy policy
• About Wikipedia
• Disclaimers

• 
•