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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, but could form brass from .35 Whelen cases. Quality Cartridge has manufactured unformed, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
400 Whelen Sketch Spec
4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. In mathematics Four is the smallest composite number, its proper divisors being and . Four is the sum and product of two with itself: 2 + 2 = 4 = 2 x 2, the only number b such that a + a = b = a x a, which also makes four the smallest squared prime number p^. In Knuth's up-arrow notation, , and so forth, for any number of up arrows. By consequence, four is the only square one more than a prime number, specifically three. The sum of the first four prime numbers two + three + five + seven is the only sum of four consecutive prime numbers that yields an odd prime number, seventeen, which is the fourth super-prime. Four lies between the first proper pair of twin primes, three and five, which are the first two Fermat primes, like seventeen, which is the third. On the other hand, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
