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.22 BB
Bb capsmall2.jpg
A .22 CB cap, .22 short, and .22 Long Rifle; the BB cap is the same length as the CB cap, but uses a round ball
Type target
Place of origin USA
Production history
Designer Flobert
Designed 1845
Parent cartridge tapered percussion cap
Bullet diameter .222 in (5.6 mm)
Neck diameter .224 in (5.7 mm)
Base diameter .224 in (5.7 mm)
Rim diameter .270 in (6.9 mm)
Rim thickness .040 in (1.0 mm)
Case length .284 in (7.2 mm)
Overall length .343 in (8.7 mm)
Primer type Rimfire
Ballistic performance
Bullet weight/type Velocity Energy
20 gr (1 g) rn 780 ft/s (240 m/s) 26 ft·lbf (35 J)
18 gr (1 g) rn 780 ft/s (240 m/s) 24 ft·lbf (33 J)
16 gr (1 g) rn 750 ft/s (230 m/s) 20 ft·lbf (27 J)
Source(s): Cartridges of the World [1]

.22 BB Cap (Bulleted Breech Cap) is a variety of .22 caliber rimfire ammunition. .22 BB cap and .22 CB refer to cartridges that are low velocity and project reduced noise. These rimfires closely resemble a .22 caliber air rifle in power and are often used for indoor shooting and close range pest control. Developed for indoor shooting galleries with special "gallery guns", the .22 BB Cap was the first rimfire cartridge, dating back to 1845. It has no separate propellant charge, relying on the impulse created by the primer alone to fire a round lead ball. This results in a low muzzle velocity of around 700 ft/s (210 m/s) or less. More common is the .22 CB ammunition, which fires a slightly heavier conical bullet and is available in a variety of cartridge lengths.


  • Length:
    • Case: 0.284 in (7.2 mm)
    • Overall: .343 in (8.7 mm)
  • Bullet weight: 18 grain (measure) (1.17 g)

See also


  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

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