|
7.62×38mmR (also known as 7.62 mm Nagant and Cartridge, Type R) is a unique ammunition cartridge designed for use in the Russian Nagant M1895 revolver. A small number of experimental submachine guns (e.g., Tokarev 1927), designed by Fedor Tokarev, were also produced in a 7.62 mm Nagant chambering. None, however, were accepted into Soviet service. ==Background== The projectile is seated below the mouth of the cartridge, with the cartridge crimp sitting just above the bullet. When fired in the Nagant revolver, the crimp expands into the forcing cone, completing the gas-seal and ostensibly increasing muzzle velocity by approximately 23 m/s (75 ft/s). The 7.62 mm caliber was chosen, in part, to simplify the tooling used in barrel making and manufacture of projectiles—the Russian service rifle of the time—the Mosin–Nagant M1891 featured an identical bore diameter, being chambered for the 7.62×54mmR rifle cartridge. Commercially manufactured and loaded 7.62×38R cartridges are no longer difficult to find. Most commercially loaded ammunition for the Nagant, including Fiocchi and the "СССР"-marked yellow box imports, are target ammunition, and do not have great stopping power. The low power of these rounds has given the Nagant a reputation as an underpowered sidearm. However, the original military ball cartridges fired bullets in the 6.5 g (100 grains) range at up to 330 m/s (1,100 ft/s), making them close to the .32-20 Winchester and .32 H&R Magnum in power. These original military ball rounds are very hard to find and are considered collector's items. One advantage of the round, if proper brass can be found, is that it leaves the chambers totally clean, and there is no need to scrape lead and powder residue out. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「7.62×38mmR」の詳細全文を読む スポンサード リンク
|