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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.
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.
338 Spectre : Uses 10mm Magnum pistol cases with a 6.8 SPC bolt-face. A shoulder is formed, and the case is lightly trimmed to length, and the neck is sized to .338, down from 0.401". The 10mm rim is 0.424" (10.8mm) in diameter, and the SPC rim diameter is 0.422" (10.7mm). The .338 caliber bullets are available in weights between 200gr-250gr.
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).
.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
It is the parent case for the 6.8mm Remington SPC, [1] which is in turn the parent case for the .224 Valkyrie. The .30 Remington, along with the 25 Remington , .32 Remington. and .35 Remington were created for use in the Remington Model 8 rifle, to compete against the .25-35 Winchester , .30-30 Winchester and .32 Winchester Special .
The case diameter and taper resemble those of the 6.8mm Remington SPC, so Nosler recommends using a magazine designed for that cartridge. While similar to the 6.8 SPC in some regards, there is no parent case and the .22 Nosler cannot be formed from 6.8 SPC brass. The .224 Valkyrie is a similar cartridge, but the two are not interchangeable.