.30-40 Krag

.30-40 Krag
TypeRifle
Place of originUnited States
Service history
In service1892–1903
Used byUnited States
Production history
Designedearly 1890s
Produced1892–present
Specifications
Case typeRimmed, 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 length2.314 in (58.8 mm)
Overall length3.089 in (78.5 mm)
Case capacity58.0 gr H2O (3.76 cm3)
Maximum pressure (C.I.P.)47,137 psi (325.00 MPa)
Maximum CUP40,000[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]

  1. ^ Saami pressures. (n.d.). Retrieved May 3, 2023, from https://leverguns.com/articles/saami_pressures.htm
  2. ^ ".30-40 data at Hodgdon Online". Archived from the original on 2007-11-11. Retrieved 2007-08-01.
  3. ^ Laststandonzombieisland. (2020, February 7). Great War Gatling Guns?. laststandonzombieisland. https://laststandonzombieisland.com/2020/02/07/great-war-gatling-guns/
  4. ^ Association, N. R. (n.d.). Men and guns of the 1900 China relief expedition. An Official Journal Of The NRA. https://www.americanrifleman.org/content/men-and-guns-of-the-1900-china-relief-expedition/
  5. ^ Colt 1897 gatling gun rifle 30-40. Rock Island Auction Company. (n.d.). https://www.rockislandauction.com/detail/61/1270/colt-1897-gatling-gun-rifle-3040
  6. ^ Colt U.S. navy mark II model 1900 gatling gun with carriage. Rock Island Auction Company. (n.d.-b). https://www.rockislandauction.com/detail/83/1219/colt-us-navy-mark-ii-model-1900-gatling-gun-with-carriage