What's a BB-cap?

A very short .22 casing loaded with a round ball. Usually no powder, primer is the propellant. One of the very first breech loading cartridges.
 
michaelsabre said:
I heard this again and again....but....what's a BB-cap?:redface:
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"Bulleted-breach-cap", a variation on a CB or "conical ball". The traditional Flobert CB has a true round ball, the BB has a bullet shaped lead slug.
 
Definition for "bulleted-breech cap":
(BB cap) The bulleted-breech cap is the oldest self-contained cartridge having been developed in 1845. Most commonly used in low-noise, low-recoil .22 caliber gallery shooting, the cartridge design consists of a primed cap attached to a bullet, with no other external or internal propellants. Still manufactured today in various rimfire calibers.
 
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