.22 BB
.22 BB Cap (Bulleted Breech Cap), also known as the 6mm Flobert, is a variety of .22 caliber rimfire ammunition. Invented by Louis-Nicolas Flobert in 1845, it was the first rimfire metallic cartridge. The .22 BB Cap and .22 CB Cap are interchangeable and are relatively quiet low velocity cartridges, designed for indoor target shooting.
| .22 BB | ||||||||||||||||
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.22 BB Cap or 6mm Flobert with Container | ||||||||||||||||
| Type | Rifle | |||||||||||||||
| Place of origin | France | |||||||||||||||
| Production history | ||||||||||||||||
| Designer | Louis-Nicolas Flobert | |||||||||||||||
| Designed | 1845 | |||||||||||||||
| Produced | 1845–present | |||||||||||||||
| Specifications | ||||||||||||||||
| Parent case | Tapered percussion cap | |||||||||||||||
| Case type | Rimmed, straight | |||||||||||||||
| 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 | |||||||||||||||
| Maximum pressure (CIP) | 51.6 ft⋅lbf (70.0 J) | |||||||||||||||
| Ballistic performance | ||||||||||||||||
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| Source(s): Cartridges of the World | ||||||||||||||||
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