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6.5mm Creedmoor
The 6.5mm Creedmoor is a centerfire rifle cartridge introduced by Hornady in 2007〔http://bulletin.accurateshooter.com/2007/11/hornady-introduces-new-65-creedmoor-cartridge/〕 as a modification of the .30 TC.〔 It was designed specifically for rifle target shooting competition,〔 although it is also achieving success in hunting.〔 Bullet for bullet it achieves a slower muzzle velocity than longer cartridges such as the 6.5-284 Norma or magnums such as the 6.5mm Remington Magnum. However, due to its 2.825 inch overall length, the 6.5mm Creedmoor is capable of being chambered in short-action bolt rifles and AR-10 rifles.
==Design considerations==
6.5 mm (.264") bullets, in general, are known for their relatively high sectional density and ballistic coefficients, and have seen success in rifle competition. For some loads the 6.5mm Creedmoor is capable of duplicating the muzzle velocity〔 or trajectory〔(Hornady ballistics charts )〕 of the .300 Winchester Magnum while generating significantly lower recoil, based on lighter projectile weight. As this cartridge is designed for a bolt face diameter of .473 inches (roughly 12 mm), conversion of a short action rifle to it from another caliber (such as the .22-250 Remington, .243 Winchester or .300 Savage) with similar bolt face diameter generally requires little more than a simple barrel change.
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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