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The 6.8mm Remington Special Purpose Cartridge (6.8 SPC, 6.8 SPC II or 6.8×43mm) is a rimless bottlenecked intermediate rifle cartridge that was developed by Remington Arms in collaboration with members of the U.S. Army Marksmanship Unit and United States Special Operations Command [6] to possibly replace the 5.56 NATO cartridge in short barreled rifles (SBR) and carbines.
The rebated rim dimensions exactly match the 6.8mm Remington SPC case, allowing the use of the 6.8mm SPC bolt-face of an AR-15, but the case has a base diameter of .4400" and cannot be reformed from any other existing case. The 400 LGND uses .4005" jacketed rifle bullets. 450 Bushmaster : Uses .284 Winchester cases. Cut the length to 1.700" to ...
The .277 Fury or 6.8×51mm Common Cartridge [4] [5] (designated as the .277 SIG Fury by SAAMI) [1] is a centerfire rimless bottlenecked rifle cartridge announced by SIG Sauer in late 2019. [2] Its hybrid three-piece cartridge case has a steel case head and brass body connected by an aluminum locking washer to support the high chamber pressure ...
.14-222.17-223.17 Ackley Bee.17 CCM.17 Hornet.17 Mach IV.17 Remington.17 Remington Fireball.19-223.19 Badger.19 Calhoon Hornet.20 BR.20 Tactical
The .277 Wolverine has shown near-comparable performance to the 6.8 SPC with 110 gr (7.13 g) bullets, achieving similar muzzle velocities of 2,500 fps (762 m/s) vs. 2,700 fps (823 m/s). The smaller case of the .277 Wolverine (compared to the 6.8 SPC) is more efficient and has less recoil due to its smaller propellant load.
The SIG Sauer MCX-SPEAR (the rifle's commercial designation) is chambered in the 6.8×51mm (.277 in) SIG Fury cartridge in response to concerns that improvements in body armor would diminish the effectiveness of ammunition such as the 5.56×45mm NATO (for the M4 and M249) and 7.62×51mm NATO (for M240).
The designation of M468 stands for an M4 carbine chambered for the 6.8mm SPC cartridge. It was an attempt to create an optimal Special Operations close-to-medium range carbine for Close Quarter Battle (CQB). A 12-inch barreled micro-carbine and 16-inch barreled carbine version were created. Barrett ceased manufacturing the rifle in 2010. [4]
It is an M4 carbine utilizing a short-stroke gas piston system and is available in either 5.56×45mm NATO or 6.8mm Remington SPC. The REC7 is Barrett's second AR-pattern rifle chambered for the 6.8mm Remington SPC cartridge, the first being the Barrett M468 rifle. The 6.8 SPC-chambered M468 rifle employed the same Stoner expanding gas system as ...