.30-40 Krag

.30-40 Krag
Type	Rifle
Place of origin	United States
Service history
In service	1892–1903
Used by	United States
Production history
Designed	early 1890s
Produced	1892–present
Specifications
Case type	Rimmed, bottleneck
Bullet diameter	.308 in (7.8 mm)
Land diameter	.301 in (7.6 mm)
Neck diameter	.338 in (8.6 mm)
Shoulder diameter	.423 in (10.7 mm)
Base diameter	.457 in (11.6 mm)
Rim diameter	.545 in (13.8 mm)
Rim thickness	.064 in (1.6 mm)
Case length	2.314 in (58.8 mm)
Overall length	3.089 in (78.5 mm)
Case capacity	58.0 gr H2O (3.76 cm3)
Maximum pressure (C.I.P.)	47,137 psi (325.00 MPa)
Maximum CUP	40,000[1] CUP
Ballistic performance
Bullet mass/type Velocity Energy 100 gr (6 g) SP 2,898 ft/s (883 m/s) 1,865 ft⋅lbf (2,529 J) 130 gr (8 g) HP 2,746 ft/s (837 m/s) 2,177 ft⋅lbf (2,952 J) 150 gr (10 g) Nos Part 2,575 ft/s (785 m/s) 2,209 ft⋅lbf (2,995 J) 180 gr (12 g) SP 2,276 ft/s (694 m/s) 2,071 ft⋅lbf (2,808 J) 200 gr (13 g) RN 1,974 ft/s (602 m/s) 1,731 ft⋅lbf (2,347 J)
Source(s): Hodgdon [2]

The .30-40 Krag, also known as the .30 U.S. and .30 Army, was a rifle cartridge developed in the early 1890s to provide the U.S. armed forces with a smokeless powder cartridge suited for use with modern small-bore repeating rifles to be selected in the 1892 small arm trials. Since the cartridge it was replacing was the .45-70 Government, the new cartridge was considered small-bore at the time. The rifle ultimately selected for use by the Army was the Krag–Jørgensen, formally adopted as the M1892 Springfield. The cartridge was also used in the M1893, M1895, M1897, and M1900 Gatling guns.^[3][4][5][6]