.277 Fury Explained

.277 Fury
Origin:United States
Type:Centerfire rifle
Design Date:2019
Manufacturer:SIG Sauer
Production Date:2019–present
Case Type:Rimless, bottleneck
Bullet:.2780
Land:.2700
Neck:.3100
Shoulder:.4611
Base:.4703
Rim Dia:.4720
Rim Thick:.0540
Case Length:2.015
Length:2.825
Rifling:1 in 7 in. (177.8 mm)
Max Pressure:80000
Pressure Method:SAAMI
Bw1:135
Btype1:Hybrid match
Vel1:3000
En1:2694
Bw2:135
Btype2:Elite ball FMJ
Vel2:2750
En2:2267
Bw3:140
Btype3:VLD match
Vel3:2950
En3:2706
Test Barrel Length:16 inch (406 mm)
Balsrc:[1]

The .277 Fury or 6.8×51mm Common Cartridge,[2] [3] (designated as the .277 SIG Fury by SAAMI[4]) is a centerfire rimless bottlenecked rifle cartridge announced by SIG Sauer in late 2019.[5] 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 of 800001NaN1.[5]

Background

The cartridge was designed by SIG Sauer for the United States Army's Next Generation Squad Weapon Program (NGSW).[5] [6] It is dimensionally similar to the 7.62×51mm NATO service cartridge.

In December 2019, the cartridge was announced for non-military usage, along with the SIG Sauer CROSS bolt-action rifle. As a short-action rifle cartridge (cartridges having an overall length of 2.75inches or less), increased internal ballistic performance for its cartridge case volume is accomplished by applying high gas pressure.[7] In 2020, it was accepted by the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) as a new rifle cartridge and chambering.[8] In 2022, SIG Sauer announced that it intends to commercially chamber the SIG MCX Spear semi-automatic rifle in .277 Fury.[9]

Specifications

The cartridge uses a case that is the same length and diameter as the .308 Winchester. Each "hybrid" cartridge case consists of a stainless steel base coupled to a brass body via an aluminium locking washer.[10] Stainless steel has a significantly higher yield strength than brass, allowing the engineers to use higher maximum average pressure (MAP) chamber pressure levels.[11] Bullets are either 135gr "match grade" with a G1 ballistic coefficient of ≈ .488 or 140gr "hunter tipped" with a G1 ballistic coefficient of ≈ .508 (ballistic coefficients are somewhat debatable).[12] [13]

These projectile ballistic coefficients are equal to the publicized specifications of the Sierra .277 135gr HPBT MatchKing and .277 140gr TGK GameKing projectiles.[14] The SAAMI warns that MAP levels greater than 650001NaN1 may present an increased risk of unsafe cartridge case or firearm rupture and thus will require new cartridge case and firearm designs that depart from traditional manufacturing practices, including the use of materials, construction methods, production lines, and other important design criteria.[4] [15] [16]

The .277 Fury SAAMI (voluntary) MAP chamber pressure of 800001NaN1 enables a projectile muzzle velocity of 3000ft/s from a 16inches barrel.[4] [17] It also means that the .277 Fury is normally chambered in small arms that are capable of handling the accompanying bolt thrust safely.

Commercially, reduced-power .277 Fury Elite ball FMJ ammunition using non-hybrid conventional cartridge cases is offered, that fires a projectile with a G1 ballistic coefficient of ≈ .475 at a muzzle velocity of 2750ft/s from a 16inches barrel.

Performance

SIG Sauer claims that the cartridge has performance superior to the 6.5mm Creedmoor, exhibiting 6to less bullet drop at 1000yd, while delivering 20–25% greater energy.[18]

Military award and designation as 6.8 common cartridge

In January 2019, the United States military began the Next Generation Squad Weapon Program to find replacements for the M4 carbine and M249 light machine gun. On April 19, 2022, the United States Army announced that it had selected SIG Sauer to build the XM7 rifle to partly replace the M4 carbine, while the XM250 automatic rifle was to replace the M249 SAW in the LMG role. In both cases it had selected the company's Fury ammunition, utilizing government provided projectiles and vendor-designed cartridges as the new weapon's ammunition.[19] [20]

The XM7 was designed to fire the 6.8×51mm SIG Fury cartridge in response to concerns that improvements in body armor would diminish the effectiveness of the 5.56×45mm NATO round used in the M4 carbine and M249 SAW and increase their lethality and effective ranges compared to common battlefield rounds such as the 5.56×45mm NATO and 7.62×51mm NATO.[21] [22] [23] [24]

Operational testing of the XM7 rifle, XM250 automatic rifle, XM157 fire control optic platform agnostic unit and the 6.8×51mm ammunition squad weaponry is expected to begin in 2024. However, this does not guarantee actual widespread future issue.[25] The military designation for this round is 6.8 common cartridge.[3] The XM1186 is the general-purpose 6.8 mm round, with other versions including reduced range rounds so weapons chambered in 6.8 mm can fire on existing ranges designed for the 5.56 mm, marking rounds for force-on-force shooting, and blank and tracer rounds.[26]

Military solicitation

As of March 2022, the United States Army has a solicitation ongoing for an M240 machine gun 6.8×51mm conversion kit for the 7.62×51mm NATO-chambered M240B and M240L general-purpose machine guns.[25] [27]

External links

Notes and References

  1. Web site: .277 SIG Fury Elite Ball FMJ . live . https://web.archive.org/web/20231214211147/https://www.sigsauer.com/elite-ball-fmj-277-sig-fury.html . 14 December 2023 . SIG Sauer.
  2. Web site: Beckstrand . Tom . 19 February 2020 . NGSW Update: Push for the 6.8mm Continues . live . https://web.archive.org/web/20200224112505/http://www.gunsandammo.com/editorial/ngsw-update-push-68mm-continues/372371 . 24 February 2020 . Guns & Ammo.
  3. Web site: 20 April 2022 . Next Generation Squad Weapon Winner: Army Picks SIG SAUER . live . https://web.archive.org/web/20230615232827/https://www.athlonoutdoors.com/article/next-generation-squad-weapon-winner/ . 15 June 2023 . Athlon Outdoors.
  4. Web site: 23 September 2020 . SAAMI .277 SIG FURY cartridge and chamber drawings . live . https://web.archive.org/web/20231127162923/https://saami.org/wp-content/uploads/2020/11/277-Sig-Public-Introduction-Orig-2020-11-11.pdf . 27 November 2023 . 25 November 2020 . Sporting Arms and Ammunition Manufacturers' Institute.
  5. Web site: Langston . Jay . 20 December 2019 . 277 SIG Fury: SIG Sauer Unveils New Caliber with Hybrid Case Design . live . https://web.archive.org/web/20231003041531/https://www.athlonoutdoors.com/article/277-sig-fury-hybrid-case-design/ . 3 October 2023 . 17 March 2020 . Athlon Outdoors.
  6. Web site: SIG Cross Rifle . live . https://web.archive.org/web/20230711202300/https://xtremegunsandammo.com/rifles-for-sale/sig-sauer-rifles-for-sale/sig-cross-rifle/ . 11 July 2023 . 8 March 2020 . Xtreme Guns and Ammo.
  7. Web site: Eger . Chris . 19 December 2019 . New SIG Sauer CROSS Rifle, Company's 1st U.S. Made Bolt-Action Hunting Rifle . live . https://web.archive.org/web/20230615232822/https://www.guns.com/news/2019/12/19/new-sig-sauer-cross-rifle-companys-1st-u-s-made-bolt-action-hunting-rifle . 15 June 2023 . 8 March 2020 . guns.com.
  8. Web site: Moss . Matthew . 21 November 2020 . SAAMI Announces Acceptance of Three New Cartridges from SIG Sauer, Weatherby and Winchester . live . https://web.archive.org/web/20230615232831/https://www.thefirearmblog.com/blog/2020/11/18/saami-announces-acceptance-of-three-new-cartridges/ . 15 June 2023 . 25 November 2020 . The Firearm Blog.
  9. Web site: Graves . Eric . 13 January 2022 . SIG SAUER Announces Commercial Variant of Army Next Generation Squad Weapon (NGSW) MCX-SPEAR and 277 SIG FURY Ammunition . live . https://web.archive.org/web/20230927105516/https://soldiersystems.net/2022/01/13/sig-sauer-announces-commercial-variant-of-army-next-generation-squad-weapon-ngsw-mcx-spear-and-277-sig-fury-ammunition/ . 27 September 2023 . 23 April 2022 . Soldier Systems.
  10. Web site: Sim . Levi . 22 December 2019 . .277 SIG Fury Demystified . live . https://web.archive.org/web/20230615232823/https://www.gunsamerica.com/digest/277-sig-fury-demystified/ . 15 June 2023 . 17 March 2020 . gunsamerica.com.
  11. Web site: 16 November 2020 . SAAMI Certifies .277 Sig Fury Cartridge with Incredible Chamber Pressure . dead . https://web.archive.org/web/20220603160432/https://www.pottsprecision.com/blog/saami-approves-277-sig-fury . 3 June 2022 . 29 April 2022 . pottsprecision.com.
  12. Web site: 16 November 2020 . 277 SIG FURY, 2 Other Cartridges Accepted by SAAMI . live . https://web.archive.org/web/20230615232827/https://www.athlonoutdoors.com/article/277-sig-fury-accepted-saami/ . 15 June 2023 . 29 November 2020 . Athlon Outdoors.
  13. Web site: 17 January 2012 . Comparing Advertised Ballistic Coefficients with Independent Measurements . dead . https://web.archive.org/web/20230321183046/https://mittelkaliber.ch/wp-content/uploads/2021/02/BC_Vergleich_1.pdf . 21 March 2023 . 30 April 2022 . Schweizerische Mittelkaliber-Schützengesellschaft.
  14. Web site: Ballistics Coefficients Charts - Rifle . live . https://web.archive.org/web/20231121142842/https://www.sierrabullets.com/wp-content/uploads/2019/10/BC-chart-rifle.pdf . 21 November 2023 . Sierra Bullets.
  15. Web site: Maccar . David . 16 February 2017 . The End of Brass Cartridge Cases? . dead . https://web.archive.org/web/20220603115009/https://www.range365.com/end-brass-cartridge-cases/ . 3 June 2022 . 29 November 2020 . range365.com.
  16. Web site: Dykstra . Greg . 19 July 2016 . Understanding Pressure . live . https://web.archive.org/web/20230616085156/https://www.primalrights.com/library/articles/understanding-pressure . 16 June 2023 . 29 November 2020 . primalrights.com.
  17. Web site: Spomer . Ron . 26 February 2020 . The New 27 Nosler and .277 Sig Fury Are Creating a .277 Cartridge Comeback . live . https://web.archive.org/web/20230929195600/https://www.outdoorlife.com/story/guns/rise-of-the-270s-rifle-ammo/ . 29 September 2023 . 17 March 2020 . outdoorlife.com.
  18. Book: SIG Sauer Product Catalog . 2020 . SIG Sauer . 70–71 . March 17, 2020.
  19. Web site: 19 April 2022 . Army awards Next Generation Squad Weapon contract . live . https://web.archive.org/web/20240111094638/https://www.army.mil/article/255827/army_awards_next_generation_squad_weapon_contract . 11 January 2024 . 19 April 2022 . U.S. Army.
  20. Web site: 21 January 2022 . ASIG Ammunition Produced & Delivered Over 825,000 Rounds of 6.8x51mm Composite Case Ammo for US Army Next Generation Squad Weapons Program Prototype Test #2 . live . https://web.archive.org/web/20230615232823/https://soldiersystems.net/2021/01/27/sig-ammunition-produced-rounds-of-6-8x51mm/ . 15 June 2023 . 22 April 2022 . Soldier Systems.
  21. Web site: South . Todd . 19 April 2022 . Army chooses Sig Sauer to build its Next Generation Squad Weapon . live . https://archive.today/20230518053458/https://www.armytimes.com/news/your-army/2022/04/19/army-chooses-sig-sauer-to-build-its-next-generation-squad-weapon/ . 18 May 2023 . 20 April 2022 . Army Times.
  22. Web site: Schogol . Jeff . 19 April 2022 . Army selects Sig Sauer to produce Next Generation Squad Weapon and ammo . https://web.archive.org/web/20220531011525/https://taskandpurpose.com/military-tech/army-selects-sig-sauer-next-generation-squad-weapon/ . 31 May 2022 . 20 April 2022 . . en-US.
  23. Web site: Sensiba . Jennifer . 21 April 2022 . The XM5 and 6.8×51 Ammunition Will Be a Decisive Advantage. U.S. Allies Should Adopt It, Too . live . https://web.archive.org/web/20231207200017/https://www.thetruthaboutguns.com/https-defensereview-com-spikes-tactical-5-45mm-russian-ar-carbine-the-greatest-training-gun-everif-you-have-to-buy-your-own-ammunition-that-is/ . 7 December 2023 . 24 April 2022 . The Truth about Guns . en-US.
  24. Web site: Mizokami . Kyle . 21 April 2022 . The Army's Next-Gen Infantry Weapons Will Be More Lethal and More Accurate . https://web.archive.org/web/20220531010329/https://www.popularmechanics.com/military/weapons/a39774920/army-next-gen-infantry-weapons/ . 31 May 2022 . 24 April 2022 . . en-US.
  25. Web site: Parsons . Dan . 20 April 2022 . Here's Everything We Now Know About The Army's New Squad Rifles . live . https://web.archive.org/web/20231127071518/https://www.thedrive.com/the-war-zone/heres-everything-we-now-know-about-the-armys-new-squad-rifles . 27 November 2023 . 30 April 2022 . The Drive . en-US.
  26. Web site: South . Todd . 6 October 2023 . What’s the firepower like for the Army’s new rifle? . live . https://archive.today/20240115010732/https://www.defensenews.com/news/your-army/2023/10/06/whats-the-firepower-like-for-the-armys-new-rifle-automatic-rifle/ . 15 January 2024 . Defense News.
  27. Web site: 31 March 2022 . M240 6.8mm Conversion Kit . live . https://archive.today/20240115011229/https://sam.gov/opp/44d479e9fc3f4437bbf017c1f2f61b92/view . 15 January 2024 . sam.gov.

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