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The .17 Mach IV is a wildcat centerfire rifle cartridge, based on the .221 Remington Fireball case, necked down to fire a .172 bullet. The cartridge was introduced in 1962 by Vern O’Brien.〔(6mmBR 17 Caliber Wildcats )〕 The cartridge offered an easy case conversion and good ballistics, but could not compete against the .17 Remington.〔Barnes, Frank C., Cartridges of the World, 7th Edition, p171〕 The name, Mach IV, comes from the claim that the bullets can reach 4,000 ft/s.〔(Which .17? by Jim Saubier )〕 Due to the relatively small case capacity, even small variations in powder of can lead to the difference between a safe and dangerously over pressure load. The .17 Mach IV became very popular with varmint hunters, so much so that in 2007, Remington introduced its own very similar version, the .17 Remington Fireball. ==See also== *.17 Remington Fireball *.221 Fireball *4 mm caliber *List of rifle cartridges 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「.17 Mach IV」の詳細全文を読む スポンサード リンク
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