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Us M1 Cartridge Service ammunition manufactured for use in U. S. Cal..30 Carbines included a grenade-launching cartridge, tracer cartridges, and a ball cartridge with full jacketed, semi-round-nosed, flat-based bullet with nominal weight of either 108 grs. or 111 grs. depending on presence or absence of hollow cup in the base. The 108-gr. cup-based bullet was manufactured prior to Feb. 14, 1942. Average chamber pressure of the ball cartridge is 40,000 pounds per square inch with nominal muzzle velocity of 1970 feet per second. Corresponding muzzle energy with 108-gr. bullet is 930 foot-pounds, and with 111 gr. bullet is 956 foot-pounds. Following is the performance of the Cal.30 Carbine Ball Cartridge M1, based on the official firing table:   Range)      (yds)            0     100   200    300 Velocity     (f.p.s.)       1974   1580   1265   1062 Energy     (ft.-lbs.)      961    615    394    278 Trajectory height (in.)         --    1.4    7.0    20.5   To load magazine. press cartridge down with thumb until caught under magazine lips. Repeat this procedure until magazine is full. Unload magazine by pushing rounds forward and out one at a time. The 15-round magazine is normally used in the M1 carbine, but the 30-round magazine for the M2 and M3 will also work in the M1