From The Rifle in America, Philip Sharpe:
In his description of the original Krag Model 1892 "regulation rifle", he writes "The twist of this early barrel was one turn in ten inches, and it used a round nose, cupronickel jacketed bullet weighing 220 grains with 38 grains of smokeless powder."
Bolt Action Rifles, Frank De Hass:
On the Krag, "Adopted with the new rifle was a new .30 caliber cartridge. Using a rimmed, bottleneck case it was the first U.S. military cartridge loaded with smokeless powder. Officially the .30 Army or .30 Government or, more popularly, the 30-40 Krag."
