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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 ...
277 Wolverine : Standard military 5.56x45 case (also .223), shoulder is reformed lower, length is trimmed, neck is sized to .277 6.8 SPC (.277) : Proprietary. Developed as an all new cartridge in the hopes of gaining a military contract. Rim diameter is 0.421" 300 AAC Blackout : Uses military 5.56x45 (also .223). The shoulder is reformed ...
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 XM250 light machine gun and XM7 rifle were designed to fire the 6.8×51mm SIG Fury cartridge in response to concerns that improvements in body armor would diminish the effectiveness of common battlefield rounds such as the 5.56×45mm NATO (used in the M4 carbine and M249 light machine gun) and 7.62×51mm NATO. [8] [9] [10]
The SIG MCX Spear (stylized as MCX-SPEAR) is a multi-caliber rifle developed by the American division of SIG Sauer from the SIG MCX series of carbines. The SIG MCX Spear is primarily chambered in .277 SIG FURY but can be adapted to 7.62×51mm NATO and 6.5mm Creedmoor with a barrel change.
The new cartridge is designated as 6.8 × 51 Common, known in the commercial market as the .277 Fury. [31] The bullet size of the 6.8×51mm is virtually identical to the bullet of the 7mm-08 Remington. The difference in diameter is less than 1/128 of an inch (0.2 mm), or approximately the thickness of two human hairs. [32]
The new 7-mm .277 Fury round will be deployed both in an infantry battle rifle as well as in a dedicated machine gun and exemplifies the requirement of the much higher chamber pressure, 80-90,000 PSI Vs 55-60,000 PSI in the older ammunition required to attain the demanded ballistic performance with a 7-mm bullet in both weapon systems. [6]