.277 FURY

The .277 FURY or 6.8×51mm,[3] (designated as the 277 SIG FURY by the SAAMI[1]) is a centerfire rimless bottlenecked rifle cartridge announced by SIG Sauer in late 2019.[2] It utilizes a hybrid three-piece cartridge case that has a steel case head, brass body and a locking washer that mechanically connects the two to support a chamber pressure of 80,000 psi (551.6 MPa).[2]

.277 FURY
TypeCenterfire rifle
Place of originUnited States
Production history
Designedc. 2019
ManufacturerSIG Sauer
Produced2019 (announced) to present
Specifications
Case typeRimless, bottleneck
Bullet diameter.2780 in (7.06 mm)
Neck diameter.3100 in (7.87 mm)
Shoulder diameter.4611 in (11.71 mm)
Base diameter.4703 in (11.95 mm)
Rim diameter.4720 in (11.99 mm)
Rim thickness.0540 in (1.37 mm)
Case length2.015 in (51.2 mm)
Overall length2.825 in (71.8 mm)
Rifling twist1 in 7" (177.8 mm)
Maximum pressure (SAAMI)80,000 psi (550 MPa)
Ballistic performance
Bullet mass/type Velocity Energy
135 gr (9 g) Hybrid Match 3,000 ft/s (910 m/s) 2,694 ft⋅lbf (3,653 J)
140 gr (9 g) Hunting 2,950 ft/s (900 m/s) 2,706 ft⋅lbf (3,669 J)
Test barrel length: 16 inch (406 mm)
Source(s): [1][2]

BackgroundEdit

The cartridge was designed by SIG Sauer for the United States Army’s next generation squad weapons program,[4] officially known as the Next Generation Squad Weapon-Rifle (NGSW-R).[2] The cartridge was announced for non-military usage along with the SIG Sauer CROSS—a bolt-action, magazine-fed rifle—in December 2019.[5] In 2020 it was accepted by the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) as a new cartridge and chambering.[6]

SpecificationsEdit

The cartridge uses a case that is the same length and diameter as the .308 Winchester.[7] Each cartridge case consists of a stainless steel base coupled to a brass body via a locking washer.[8][9] Stainless steel has a significant higher yield strength than brass, allowing the engineers to use higher Maximum Average Pressure (MAP) chamber pressure levels.[10] Bullets are either 135 grains (8.7 g) "match grade" or 140 grains (9.1 g) "hunter tipped".[9] The SAAMI warns that Maximum Average Pressure levels greater than 65,000 psi (448.2 MPa) may present increased risk of unsafe cartridge case or firearm rupture and thus require cartridge case and/or firearm designs that depart from traditional practices (materials, construction, and other design criteria).[1][11][12]

The .277 FURY SAAMI (voluntary) Maximum Average Pressure (MAP) chamber pressure of 80,000 psi (551.6 MPa) enables a 135 grains (8.7 g) projectile muzzle velocity of 3,000 feet per second (914 m/s) from a 16-inch (406 mm) barrel.[1][7] It also means that the .277 FURY should only be chambered in small arms that are capable of handling the accompanying bolt thrust safely.

PerformanceEdit

SIG Sauer claims that the cartridge has performance superior to the 6.5mm Creedmoor, exhibiting 6 to 9 feet (1.8 to 2.7 m) less bullet drop at 1,000 yards (914 m), while delivering 20–25% greater energy.[9]

See alsoEdit

NotesEdit

ReferencesEdit

  1. ^ a b c d "SAAMI 277 SIG FURY cartridge and chamber drawings" (PDF). saami.org. Retrieved 2020-11-25. CS1 maint: discouraged parameter (link)
  2. ^ a b c d Langston, Jay (December 20, 2019). "277 SIG Fury: SIG Sauer Unveils New Caliber With Hybrid Case Design". tactical-life.com. Retrieved March 17, 2020. CS1 maint: discouraged parameter (link)
  3. ^ NGSW Update: Push for the 6.8mm Continues
  4. ^ "SIG CROSS Rifle". xtremegunsandammo.com. Retrieved March 8, 2020. CS1 maint: discouraged parameter (link)
  5. ^ Eger, Chris (December 19, 2019). "New SIG Sauer CROSS Rifle, Company's 1st U.S. Made Bolt-Action Hunting Rifle". guns.com. Retrieved March 8, 2020. CS1 maint: discouraged parameter (link)
  6. ^ Moss, Matthew (2020-11-21). "SAAMI Announces Acceptance of Three New Cartridges from SIG Sauer, Weatherby and Winchester". thefirearmblog.com. Retrieved 2020-11-25. CS1 maint: discouraged parameter (link)
  7. ^ a b Spomer, Ron (February 26, 2020). "The New 27 Nosler and .277 Sig Fury Are Creating a .277 Cartridge Comeback". outdoorlife.com. Retrieved March 17, 2020. CS1 maint: discouraged parameter (link)
  8. ^ Sim, Levi (December 22, 2019). ".277 SIG Fury Demystified". gunsamerica.com. Retrieved March 17, 2020. CS1 maint: discouraged parameter (link)
  9. ^ a b c SIG Sauer Product Catalog. SIG Sauer. 2020. pp. 70–71. Retrieved March 17, 2020. CS1 maint: discouraged parameter (link)
  10. ^ "SAAMI Certifies .277 Sig Fury Cartridge with Incredible Chamber Pressure". pottsprecision.com. 2020-11-19. Retrieved 2020-11-29. CS1 maint: discouraged parameter (link)
  11. ^ Maccar, David (2017-02-16). "The End of Brass Cartridge Cases?". range365.com. Retrieved 2020-11-29. CS1 maint: discouraged parameter (link)
  12. ^ Dykstra, Greg (2016-07-19). "Understanding Pressure". primalrights.com. Retrieved 2020-11-29. CS1 maint: discouraged parameter (link)

External linksEdit