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6.5mm Grendel
The 6.5mm Grendel (6.5×39mm) is an intermediate cartridge designed by Arne Brennan, Bill Alexander and Janne Pohjoispää as a low recoil, high accuracy, 200-800 yard cartridge specifically for the AR-15 platform. It is an improved variation of the 6.5mm PPC. Since its introduction it has proven to be a versatile design and is now expanding out into other platforms including bolt-action rifles and the Kalashnikov system.
The name "6.5mm Grendel" was a trademark owned by Alexander Arms until it was legally released to allow the cartridge to become SAAMI standardized.〔("Alexander Arms Announces: The 6.5 Grendel Is An Official SAAMI Cartridge " )〕〔http://bulletin.accurateshooter.com/2011/10/6-5-grendel-is-approved-as-sammi-cartridge-alexander-arms-gives-up-6-5-grendel-trademark/〕
==Development and history==
The 6.5mm Grendel design goal was to create an effective 200-800 yard AR-15 magazine length loaded cartridge for the AR-15 platform that surpassed the performance of the native 5.56 NATO / 223 Remington cartridge. Constrained by the length of the 5.56 mm NATO round, the Grendel designers decided to use a shorter, larger diameter case for higher powder volume while allowing space for long, streamlined, high ballistic coefficient (BC) bullets. Firing factory loaded ammunition loaded with bullets ranging from 90 to 129 grains , its muzzle velocity ranges from with 129- and bullets to with bullets (similar in velocity to a 5.56 mm round).
The case head diameter of the Grendel is the same as that of the parent case the .220 Russian, the 7.62×39mm, and PPC cases. This is larger than the 5.56×45mm NATO, thereby necessitating the use of a non-standard AR-15 bolt. The increased case diameter results in a small reduction in the capacity of standard size M16/AR-15 magazines. A Grendel magazine with the same dimensions as a STANAG 30-round 5.56 magazine will hold 26 rounds of 6.5mm ammunition.
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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