The .277 SIG Fury, also known as the 6.8×51mm Common Cartridge, is a hybrid ammunition round developed by SIG Sauer. It is notable for its high-pressure design, capable of achieving performance levels similar to magnum cartridges. The cartridge features a unique three-piece case that includes a steel base, brass body, and a locking washer, allowing it to withstand pressures up to 80,000 psi. This high pressure enables the .277 SIG Fury to achieve higher muzzle velocities and greater ballistic performance compared to traditional cartridges.
The .277 SIG Fury was developed as part of the U.S. Army's Next Generation Squad Weapon (NGSW) program, which aims to replace the 5.56×45mm NATO cartridge and the M4 Carbine and M249 Squad Automatic Weapon in military service. The goals of this program include increased range, accuracy, and lethality for infantry units. The cartridge is intended for use in both the NGSW-Rifle and NGSW-Automatic Rifle platforms.
Overall, the .277 SIG Fury represents a significant advancement in small arms ammunition technology, providing enhanced performance for both military and potentially civilian applications in the future.