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.460 Rowland
The .460 Rowland is a proprietary cartridge designed and developed by Johnny Ray Rowland, host of "The Shooting Show." After first developing the new cartridge, Rowland worked with Starline Brass to finalize commercial production of the brass and later with .460 Rowland and Clark Custom Guns to develop the first commercially available .460 Rowland Conversions for specific versions of the M1911. First production shipments of ammunition and conversions were made through these associations in 1998.
==Design==
The .460 Rowland case is approximately 1/16" longer than a conventional .45 ACP case but the overall cartridge length is the same, the bullet is simply seated more deeply. The purpose of the extended case length is to prevent the high pressure .460 Rowland from being chambered in a standard firearm chambered for the low pressure .45 ACP. This is similar to the relationship between the .357 Magnum and the .38 Special.
There are two key elements to the .460 Rowland concept. The first is a sharp increase in cartridge maximum pressure over the .45 ACP and .45 Super. Maximum Average Pressure is: 45 ACP (21,000 PSI), .45 ACP +P (23,000 PSI), .45 Super (28,000 PSI), .460 Rowland (40,000 PSI). The second is to damp or reduce the velocity of the slide in converted autoloading pistols to manageable levels. The first delivers magnum level performance and the second allows the cartridge to be easily and reliably fired from compact, light weight, high capacity, autoloading pistols.
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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