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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 .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 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 ...
Commercially, reduced-power .277 Fury Elite ball FMJ ammunition using non-hybrid conventional cartridge cases is offered, that fires a 135 grains (8.7 g) projectile with a G1 ballistic coefficient of ≈ .475 at a muzzle velocity of 2,750 feet per second (838 m/s) from a 16-inch (406 mm) barrel.
.17 PMC/Aguila.17 Hornady Mach 2.17 Hornady Magnum Rimfire.17 Winchester Super Magnum.22 BB Cap.22 CB Cap.22 Short.22 Long.22 Long Rifle.22 Extra Long
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 requires you to sort through the pdf done by a ballistic researcher. The 6.8 SPC is not the new 6.8mm cartridge. The bigger bullet will be used .277, but not the special purpose cartridge. The SPC was developed specifically for the short barrel M4 and the loss of velocity, rendering the 5.56 less useful at long range in Afghanistan.
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).