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.400 Whelen
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.
==Design==
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.〔Sharpe, Philip B. ''Complete Guide To Handloading'' (1953) Funk & Wagnalls pp.206&398〕 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 shoulder to fit the chamber of his rifles. Experimenters had less success forming cartridges by enlarging the necks of .30-06 cartridges with (or smaller) shoulders,〔(【引用サイトリンク】title=Smashing the Headspace Myth )〕 but could form brass from .35 Whelen cases.
Quality Cartridge has manufactured unformed, cylindrical empty brass cases headstamped for this cartridge.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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