.22 BB Cap is a variety of .22 caliber

Caliber

In guns including firearms, caliber or calibre is the approximate internal diameter of the barrel in relation to the diameter of the projectile used in it....

 rimfire ammunition

Ammunition

Ammunition is a generic term derived from the French language la munition which embraced all material used for war , but which in time came to refer specifically to gunpowder and artillery. The collective term for all types of ammunition is munitions...

. .22 BB cap and .22 CB

.22 CB

.22 CB Cap is a variety of .22 caliber rimfire ammunition which has a very small propellant charge , resulting in a low muzzle velocity of between 350 and 700 ft/s...

 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

Propellant

A propellant is a material that produces pressurized gas that:* can be directed through a nozzle, thereby producing thrust ;...

 charge, relying on the impulse created by the primer alone to fire a round lead

Lead

Lead is a main-group element in the carbon group with the symbol Pb and atomic number 82. Lead is a soft, malleable poor metal. It is also counted as one of the heavy metals. Metallic lead has a bluish-white color after being freshly cut, but it soon tarnishes to a dull grayish color when exposed...

 ball. This results in a low muzzle velocity of around 700 ft/s (210 m/s) or less. More common is the .22 CB

.22 CB

.22 CB Cap is a variety of .22 caliber rimfire ammunition which has a very small propellant charge , resulting in a low muzzle velocity of between 350 and 700 ft/s...

 ammunition, which fires a slightly heavier conical bullet and is available in a variety of cartridge lengths.

Specifications

• Length:
  • Case: 0.284 in (7.2 mm)
  • Overall: .343 in (8.7 mm)
• Bullet weight: 18 gr
  Grain (measure)
  A grain is a unit of measurement of mass that is nominally based upon the mass of a single seed of a cereal. From the Bronze Age into the Renaissance the average masses of wheat and barley grains were part of the legal definition of units of mass. However, there is no evidence of any country ever...
  
   (1.17 g)

See also

• .22 CB
  .22 CB
  .22 CB Cap is a variety of .22 caliber rimfire ammunition which has a very small propellant charge , resulting in a low muzzle velocity of between 350 and 700 ft/s...
  
  
• .22 Short
  .22 Short
  .22 Short is a variety of .22 caliber rimfire ammunition. Developed in 1857 for the first Smith and Wesson revolver, the .22 rimfire was the first American metallic cartridge....
  
  
• .22 Long
  .22 Long
  .22 Long is a variety of .22 caliber rimfire ammunition. The .22 Long is the second oldest of the surviving rimfire cartridges, dating back to 1871, when it was loaded with a 29 grain bullet and 5 grains of black powder, 25% more than the .22 Short it was based on...
  
  
• .22 Long Rifle
  .22 Long Rifle
  The .22 Long Rifle rimfire cartridge is a long established variety of ammunition, and in terms of units sold is still by far the most common in the world today. The cartridge is often referred to simply as .22 LR and various rifles, pistols, revolvers, and even some smoothbore shotguns have...
  
  
• .22 Magnum
• List of rimfire cartridges