The US 'Krags' were chambered for the rimmed "cartridge, caliber 30, U.S. Army", round, also known as the .30 U.S., .30 Army, or .30 Government, and, more popularly, by its civilian name, the .30-40 Krag. The .30 Army was the first smokeless powder round adopted by the U.S. military, but its civilian name retained the "caliber-charge" designation of earlier black powder cartridges. Thus the .30-40 Krag employs a round-nose 220-grain (14 g) cupro-nickel jacketed .30 caliber (7.62 mm) bullet propelled by 40 grains (3 g) of smokeless powder to a muzzle velocity of approximately 2000 feet (600 m) per second. As with the .30-30 Winchester, it is the use of black powder nomenclature that leads to the incorrect assumption that the .30-40 Krag was once a black powder cartridge.