"This cartridge is loaded with approximately 5 grains of very fine black powder and 40 grains of smokless powder adjusted to give the M9A1 antitank grenade a velocity of 180 +/-15 feet per second at 5.5 feet. the complete cartridge weighs 246 grains and is 2.49 inches long. the case weighs 200 grains." TM9-1990 SMALL-ARMS AMMUNITION, War Department September 1947.