.357's early development is given to hunter and experimenter Elmer Keith. Keith's early work in loading the .38 Special to increasingly higher pressure levels was made possible by the availability of heavy, target shooting-oriented revolvers like the Smith & Wesson 38/44 "Heavy Duty" and "Outdoorsman", .38-caliber revolvers built on .44-caliber frames. The .38-44 HV load, used the .38 Special cartridge loaded to a much higher velocity than standard .38 Special ammunition. The .38-44 revolvers were made by using a .44 Special size gun with the barrel and cylinder bored to .357 caliber (the true bullet diameter of the .38 Special). Since the frame, cylinder, and barrel were much stronger than the standard .38 Special components, it was capable of withstanding much higher pressures. The .38-44 HV round, while no longer available, was in most cases the equal of the later .357 Magnum, which works at more than double the pressure of standard .38 Special. The .357 Magnum addresses the safety issues earlier cartridges had by stretching the case by approximately 1/8th of an inch, preventing the high pressure .357 cartridge from chambering in a firearm designed for the shorter, lower pressure .38.[8] Elmer Keith also contributed the Keith-style bullet, which increased the mass of bullet located outside of the cartridge, while leaving more room inside the cartridge for powder, while also increasing the cutting power of the bullet when moving through muscle, increasing the killing effectiveness of the bullet when hunting.
圖中有兩粒357......一粒係357mag.......另一粒長小小係........357乜乜呢!好難揾
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本帖最後由 MS 於 7-7-2009 18:38 編輯 ]
