Rifle · SAAMI
.277 Fury
The US Army's Next Generation Squad Weapon (NGSW) cartridge — the first new US military rifle cartridge since 5.56mm NATO.
- Caliber
- 0.278″ · 7.061 mm
- Introduced
- 2019
- Case
- Rimless
- Primary use
- Military, Hunting, Target
- Status
- Active
- Introduced
- 2019
- Type
- Rifle
- Origin
- United States
- Inventor
- SIG Sauer / US Army
- Manufacturer
- SIG Sauer, Olin/Winchester
- Standard
- SAAMI
- Status
- Active
- Availability
- Limited
- Case capacity
- 54 gr H₂O
- Twist (typical)
- 1:8
- Primer
- Large Rifle
- Case type
- Rimless
- Max pressure
- 80,000 psi, SAAMI transducer
- Eff. range
- 800 yd
- Max range
- 5450 yd
- Recoil
- 16.8–20 ft·lb
Ballistics
Published velocity/energy data isn't available for .277 Fury.
Performance
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
SAAMI · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 7.06 | 0.278 | ✓ |
| Neck ⌀ | 7.87 | 0.310 | ✓ |
| Shoulder ⌀ | 11.71 | 0.461 | ✓ |
| Shoulder angle | 30° | — | ✓ |
| Base ⌀ | 11.95 | 0.470 | ✓ |
| Rim ⌀ | 11.99 | 0.472 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.37 | 0.054 | ✓ |
| Neck length | 6.43 | 0.253 | ≈ |
| Case length | 51.18 | 2.015 | ✓ |
| Overall length | 71.76 | 2.825 | ✓ |
Size vs familiar rounds
Drawn at true 1:1 — every case is accurate relative to the others. Absolute size depends on your screen's pixel density, so measuring one against a real ruler may be off. .277 Fury is highlighted below.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
Suitable powders
2 reloading powders listed for .277 Fury, fastest to slowest. Cross-reference in the finder →
Reloading costestimate cost per round vs factory
Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.
Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.
Firearms chambered in .277 Fury
Connected reference
History
Selected by the US Army in April 2022 as part of the NGSW program to replace the M4/M16 and M249 in frontline units. The driving requirement was defeating current and projected enemy body armor at 600+ meters — a capability gap identified after analysis of near-peer adversary protection. The .277 Fury uses a hybrid case with a steel head and brass body to contain the unprecedented 80,000 PSI operating pressure. SIG Sauer's XM5 rifle and XM250 machine gun were selected. Full fielding to combat units began 2023–2025.
FAQs
- What twist rate does .277 Fury use?
- .277 Fury typically uses a 1:8 twist rate.
- What bullet diameter is .277 Fury?
- .277 Fury uses a 0.278″ (7.061 mm) diameter bullet.
- Is .277 Fury still in production?
- .277 Fury is active; typical availability is limited.
- What is .277 Fury used for?
- .277 Fury is primarily used for military, hunting, target.
- What are the best powders for .277 Fury?
- Reloading powders commonly listed for .277 Fury include Reloader 19, Reloader 26.
Sources & provenance
- Standard SAAMI — ANSI/SAAMI Z299.4-2025 — Centerfire Rifle Velocity & Pressure Data · representative_gun, grain_ballistics archived
- Standard SAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawings archived
- Manufacturer SIG Sauer — 277 SIG FURY, 150GR HYBRID HUNTER (SKU H277SFAB150-20) · grain_ballistics, representative_gun archived
- Manufacturer SIG Sauer — 277 SIG FURY, 155GR HYBRID MATCH (SKU H277SFOTM155-20, Sierra MatchKing OTM) · representative_gun, grain_ballistics
- Manufacturer SIG Sauer — 277 SIG FURY, 135GR FMJ, ELITE BALL (SKU E277SFB135-20) · representative_gun, grain_ballistics archived
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 22 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
