|Place of origin||22x20px United States|
|Parent case||.30-06 Springfield|
|300 gr (Script error g) SP||2,300 ft/s (Script error m/s)||3,522 ft·lbf (Script error J)|
|350 gr (Script error g)||2,100 ft/s (Script error m/s)||3,430 ft·lbf (Script error J)|
|Source(s): 350gr - Barnes|
The .400 Whelen cartridge was developed by Colonel Townsend Whelen while he was commanding officer of Frankford Arsenal in the early 1920s. The cartridge resembles a .30-06 Springfield case necked up to .40 caliber to accept bullets manufactured for the .405 Winchester.
Colonel Whelen asserted the very small remaining portion of the .30-06's 17° 30′ angled shoulder was likely to cause potentially dangerous headspace difficulties. The headspace issue has been widely discussed. Frankford Arsenal machine shop foreman James Howe necked down cylindrical brass available in the arsenal manufacturing process to form cartridges with a .458-inch-diameter (Script error mm) shoulder to fit the chamber of his rifles. Experimenters had less success forming cartridges by enlarging the necks of .30-06 cartridges with .441-inch-diameter (Script error mm) (or smaller) shoulders, but could form brass from .35 Whelen cases.
Griffin & Howe chambered custom-built rifles for this cartridge; and using neck resizing with cases carefully fire formed to the chamber in which the loaded cartridges were to be used, these rifles were reportedly very effective for killing elk, moose, and bear at ranges up to 400 yards (Script error m).
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