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Depending on their case material and bullet weight, 6.5mm Grendel cartridges weigh 14.7 to 17.8 grams (227 to 275 gr). The case head diameter of the Grendel is the same as that of the 5.6×39mm (.220 Russian), 7.62×39mm and 6.5mm PPC cases. This diameter is larger than the 5.56×45mm NATO, thereby necessitating the use of a non-standard AR-15 ...
The AR-15 rifle usually comes chambered for either the military cartridge 5.56×45mm or the .223 Remington. Because of the pressures associated with the 5.56×45mm, it is not advisable to fire 5.56×45mm rounds in an AR-15 marked as .223 Remington, since this can result in damage to the rifle or injury to the shooter. [1]
The 7.62×45mm cartridge is approximately of the same overall length as the 5.56 NATO and .223 Remington cartridges common in the United States, and will "fit" into AR-15 pattern magazines designed for the 6.5mm Grendel cartridge (as well as those for cartridges with dimensionally close case bodies).
For an ordinary AR-15 rifle chambered for the .223 Rem/5.56mm NATO, a new barrel, magazine and bolt are required to convert to the 6mm ARC. [7] The 6mm ARC utilizes the same bolt head size as the 6.5mm Grendel , and 6.5mm Grendel-compatible AR-pattern box magazines have also been used successfully with the 6mm ARC. [ 8 ]
The cartridge uses a 6.5 Grendel case that has been necked-down to accept a 6.2 mm (.243 in) bullet. [citation needed] The 6mm AR takes advantage of the wide variety of 6.2 mm (.243 in) caliber bullets. Slim, long bullets with high ballistic coefficient are ideal for energy retention at long ranges.
Introduced on Christmas Eve, 2023, Ruger's 2nd Generation Ruger American Rifles feature a 20 in (510 mm) fluted barrel with 5/8"-24 (Standard model) or 1/2"-28 (Ranch) barrel threading for muzzle devices, an ergonomic stock allowing the shooter to easily adjust the stock's height and length, and a replaceable bolt handle.
Robinson Armament also produced an 18.6" barrel version for the Canadian market. The XCR rifles intended for the Canadian market were shipped with the FAST stock (fully adjustable stock), although aftermarket stocks are available as an accessory. These rifles shipped with a single magazine pinned to accept only five rounds.
The 6.5mm Creedmoor designated as 6.5 Creedmoor by SAAMI, and as 6,5 Creedmoor by the C.I.P. [ 4 ] is a centerfire rifle cartridge introduced by Hornady in 2007. [ 6 ] It was developed by Hornady senior ballistics scientist Dave Emary in partnership with Dennis DeMille, the vice-president of product development at Creedmoor Sports, hence the name.