6.8×51 mm (.277 Fury)
Full power
Next-generation U.S. Army cartridge with bi-metallic hybrid case: 80,000 psi to defeat modern body armor.
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Overview
Developed by SIG Sauer within the NGSW (Next Generation Squad Weapon) program. The case combines an ultra-strong stainless-steel head with a light brass body, joined by an aluminum locking ring. This allows chamber pressures around 550 MPa (80,000 psi), well above 7.62 NATO.
Specifications
- Bullet diameter
- 7,00 mm (.277")
- Case length
- 51,0 mm
- Overall length
- 71,1 mm
- Bullet weight
- 8,7 g (135 gr)
- Typical muzzle velocity
- ≈ 945 m/s (canna 16")
- Typical energy
- ≈ 3880 J
- Max pressure
- ≈ 550 MPa (80.000 psi)
- Introduced
- 2022
Pros
- +Penetration of Level IV plates at 600 m.
- +More energy than 7.62 NATO in a case of the same length.
Cons
- −Complex and expensive ammunition to produce.
- −Heavy recoil, new logistics chain for the Army.
History and use
Selected in 2022 by the U.S. Army together with the SIG Sauer XM7 rifle and XM250 machine gun, replacing M4 and M249 in line infantry squads.
Weapons adopting it (2)
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