Argentine .223 Remington by FMSF

This is one of the rarest .223 Remington cartridges and was made in Argentina by now long defunct Fábrica Militar “San Francisco” located in San Francisco city, San Justo department, Córdoba province. This was probably just a prototype and nothing is known about it, nor even by technicians of sister factory FM “FLB” who developed and produced their own version between 1982 and 1985.

Note irregular neck with lack of crimp, headstamp showing traces of diagram marks left in the headstamp bunter and very narrow head groove of only 1.35 mm (0.053"). Bullet is M193 type with lead core and GM jacket.