pinfire

an obsolete type of brass cartridge in which the priming compound is ignited by striking a small pin which protrudes radially from just above the base of the cartridge.
Found on http://en.wikipedia.org/wiki/Glossary_of_firearms_terms

Pinfire

An early form of complete, self-contained cartridge. It included bullet, powder and ignition primer, all in one package. The primer was located towards the base of the cartridge, but completely internally. The pin, shaped like a little finishing nail, pointed on the inside end and resting on the internal primer, projected radially about a quarter-i...
Found on http://www.hallowellco.com/abbrevia.htm
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