It was a prominent round used by the Alphabet Bandits in Beverly Hills Cop II, but, according to Axel Foley, the cartridge needed to be custom made, so tracing the casings back to the Beverly Hills Shooting Club led to their downfall.
Its rimless, straight wall case was originally formed by trimming the .308 Winchester or .30-06 case to 1.30 inches (33 mm). Loaded ammunition was once available from the Mexican firm of Cartuchos Deportivos Mexico and from Norma (a Swedish firm), which produced empty cases.
The .357AMP round went into production in 1972 with the North Hollywood guns. It is similar to the .44 AMP, but is necked down to accept the smaller diameter bullet. The same is true for the .41JMP, .30, .25 and .22LMP.
Presently, loaded ammunition is available from Cor-Bon, and new .44 AMP brass is available from Starline Brass. The dedicated handloader can form AMP cases from .30-06 or .308 Winchester brass, using a series of forming dies and an inside neck reamer.