.277 Fury Reloading Data

Reliable .277 Fury reloading data is currently entering the commercial market, with baseline performance metrics established by SAAMI and the cartridge’s creator, SIG Sauer. Published specifications strictly separate the cartridge into 65,000 PSI all-brass loads and military-grade 80,000 PSI bi-metal hybrid cases. Common bullet weights for the .277 Fury range from 135-grain target projectiles up to 150-grain and 155-grain hunting and match bullets. Because major powder manufacturers are still finalizing their laboratory testing, handloaders must currently reference SAAMI cartridge dimensions and SIG Sauer’s factory velocity baselines.

.277 Fury Reloading Data

Bullet	Bullet Weight	Powder	Published Starting Load	Published Maximum Load	Published Velocity	Pressure (Max)	Primer & Case	Cartridge Overall Length (COL)	Barrel Length / Firearm	Source
SIG Elite Ball FMJ	135 grain	Factory Proprietary	Not Listed	Not Listed	2,750 fps	65,000 PSI	Large Rifle / SIG Brass	2.825″	16.00″ / Universal	SIG Sauer / SAAMI
SIG Hybrid Match	135 grain	Factory Proprietary	Not Listed	Not Listed	3,000 fps	80,000 PSI	Large Rifle / SIG Hybrid	2.825″	16.00″ / Universal	SIG Sauer / SAAMI
Nosler AccuBond	150 grain	Factory Proprietary	Not Listed	Not Listed	3,120 fps	80,000 PSI	Large Rifle / SIG Hybrid	2.825″	24.00″ / Universal	SIG Sauer
Sierra MatchKing	155 grain	Factory Proprietary	Not Listed	Not Listed	3,000 fps	80,000 PSI	Large Rifle / SIG Hybrid	2.825″	16.00″ / Universal	SIG Sauer / SAAMI
SIG Solid Ball (Mil)	113 grain	Factory Proprietary	Not Listed	Not Listed	3,200 fps	80,000 PSI	Large Rifle / SIG Hybrid	2.825″	16.00″ / Universal	SIG Sauer

Understanding The .277 Fury Reloading Data

To safely develop a .277 Fury load recipe, handloaders must understand the unprecedented variables surrounding this Next Generation Squad Weapon (NGSW) cartridge:

• Starting load: The minimum safe powder charge. As authoritative powder manuals are currently developing their specific grain counts for this new caliber, reloaders must rely on baseline factory data to understand expected velocity nodes.
• Maximum published load: The absolute pressure ceiling. For the .277 Fury, this is strictly dictated by the type of brass case utilized.
• Velocity: The speed of the bullet in feet per second (fps). The cartridge was designed to push 135-grain to 140-grain bullets to 3,000 fps from short barrels.
• Pressure: The defining characteristic of the .277 Fury. Standard all-brass cases are limited to 65,000 PSI. The specialized three-piece hybrid cases (featuring a stainless steel base) are rated by SAAMI for a massive 80,000 PSI.
• Bullet weight: The mass of the 0.277-inch projectile in grains.
• Powder: The specific propellant. The 277 Fury case (which is essentially a .308 Winchester necked down to 6.8mm) utilizes medium-to-slow burning rifle powders.
• Barrel length: Test barrels for the .277 Fury are primarily 16 inches, reflecting its military carbine origins, though 24-inch data exists for commercial hunting applications.
• Firearm used for testing: Universal receiver test barrels, the SIG MCX-SPEAR, or the SIG CROSS bolt-action rifle.
• Cartridge overall length (COL): The total length of the loaded round. The SAAMI maximum COL is 2.825 inches to ensure compatibility with standard short-action (AR-10/.308 size) magazines.

Different sources produce varying results because the extreme 80,000 PSI pressure limit requires proprietary manufacturing techniques. A load developed in a hybrid case cannot be safely replicated in a standard brass case.

.277 Fury Bullet Weight Reloading Data

The .277 Fury utilizes standard 0.277-inch diameter bullets (the same diameter as the .270 Winchester).

• 113 grain: The military solid-copper ball load. Driven to 3,200 fps, this lightweight, high-velocity projectile was designed to defeat modern body armor at extended ranges.
• 135 grain: The standard commercial target weight. SIG produces both a 65,000 PSI brass-cased version (2,750 fps) and an 80,000 PSI hybrid-cased version (3,000 fps).
• 150 grain: The primary hunting weight. Utilizing the Nosler AccuBond, SIG’s hybrid hunting load boasts an incredible 3,120 fps from a 24-inch barrel, effectively matching 7mm Remington Magnum performance from a short-action cartridge.
• 155 grain: Heavy match bullets, typically utilizing the Sierra MatchKing. Driven to 3,000 fps, these offer excellent long-range wind deflection capabilities.

Do not assume you can load heavy 150-grain bullets to 3,120 fps using standard reloading dies and standard brass. That velocity is only achievable using the 80,000 PSI hybrid case.

.277 Fury Powder Reloading Data

Because authoritative powder manufacturers (Hodgdon, Alliant, Ramshot) are still finalizing their laboratory pressure-testing for commercial release, proprietary factory powders currently dictate the .277 Fury load data chart.

Based on internal case volume (which is nearly identical to a .308 Winchester necked down to .277), ballistic software and independent testers indicate the cartridge will rely on medium-to-medium-slow burning rifle powders. Powders in the burn rate class of Hodgdon Varget, H4350, Alliant Reloder 16, and Winchester 760 are expected to be the industry standards once official charge weights are published. Handloaders must wait for officially published, pressure-tested powder charges before attempting to replicate factory 80,000 PSI velocities.

.277 Fury Bullet And Powder Combinations

The exact component combinations determine the safety and reliability of .277 Fury load development.

• Case construction: This is the most critical factor. The SIG Hybrid case utilizes a stainless steel base joined to a brass body via an aluminum locking washer. This steel base is what allows the cartridge to contain 80,000 PSI without the primer pocket expanding or the case head failing.
• Standard brass limits: Commercial .277 Fury ammunition is also sold in traditional, single-piece brass cases. These cases cannot withstand 80,000 PSI. They are strictly limited to standard short-action pressures (65,000 PSI).
• Primer: The cartridge utilizes Large Rifle primers.
• Bullet construction: Monolithic copper bullets (like the 113-grain military load) create more bore friction than standard lead-core bullets, generating higher pressures faster.

.277 Fury Velocity From Published Data

Published .277 Fury velocity figures demonstrate the massive performance gap between the two case types.

Bullet	Bullet Weight	Case Type	Published Velocity	Barrel Length	Firearm	Source
SIG Elite FMJ	135 grain	Standard Brass (65k PSI)	2,750 fps	16.00″	Universal	SIG Sauer
SIG Hybrid Match	135 grain	Hybrid Bi-Metal (80k PSI)	3,000 fps	16.00″	Universal	SIG Sauer
Nosler AccuBond	150 grain	Hybrid Bi-Metal (80k PSI)	3,120 fps	24.00″	Bolt Action	SIG Sauer

Clearly distinguish between the 65,000 PSI and 80,000 PSI loads. Attempting to push a 135-grain bullet to 3,000 fps in a standard brass case will result in catastrophic firearm failure.

.277 Fury Reloading Data By Barrel Length

The .277 Fury was specifically engineered to overcome the velocity loss traditionally associated with short barrels.

To achieve 3,000 fps with a 135-grain bullet in a 16-inch military carbine, SIG had to increase the chamber pressure to 80,000 PSI. If that same 80,000 PSI load is fired through a 24-inch bolt-action rifle, velocities increase dramatically (as seen with the 150-grain hunting load reaching 3,120 fps). Conversely, standard 65,000 PSI brass-cased ammunition fired from a 16-inch barrel performs very similarly to a 7mm-08 Remington, yielding roughly 2,700 to 2,750 fps.

.277 Fury Energy And Ballistics

The .277 Fury was adopted to deliver overwhelming kinetic energy at 500 meters, outperforming the 5.56 NATO and 7.62 NATO. Using verified SIG factory data from a 16-inch barrel:

• 135-grain Hybrid Match (at 3,000 fps):
  • Muzzle energy: 2,697 ft-lbs
• 155-grain Hybrid Match (at 3,000 fps):
  • Muzzle energy: 3,097 ft-lbs

Even from a short 16-inch barrel, the 155-grain hybrid load generates over 3,000 ft-lbs of energy, rivaling the performance of a .300 Winchester Magnum while fitting inside an AR-10 sized platform.

Manufacturer Data vs Independent Testing

When researching a .277 Fury load data chart, handloaders will currently encounter:

1. SAAMI and Manufacturer Baseline Data: Officially pressure-tested velocity and dimension limits established by SAAMI and SIG Sauer.
2. Ballistic Calculator Estimates: Independent reloaders utilizing software like QuickLOAD or Gordon’s Reloading Tool to estimate powder charges based on case volume.
3. User-submitted load reports: Internet forum recipes from early adopters necking down .308 Winchester brass to .277.

Because official powder manuals have not yet published dedicated .277 Fury tables, handloaders must exercise extreme caution. Relying on mathematical estimates from ballistic software rather than pressure-tested laboratory data carries significant risk. Priority must always remain with official, pressure-tested manufacturer limits once they are published.

.277 Fury Pressure And Safety

Safety is paramount when discussing the .277 Fury. It operates at a higher chamber pressure than any other commercially available rifle cartridge in history.

The 80,000 PSI limit is solely for the three-piece, stainless-steel-based hybrid cases. If a handloader purchases standard brass .277 Fury cases (or necks down .308 Winchester brass) and attempts to load them to 80,000 PSI, the brass case head will rupture, venting high-pressure gas into the action and destroying the firearm.

Standard brass cases must be strictly limited to traditional short-action pressures (62,000 to 65,000 PSI). Furthermore, the firearm itself must be designed to handle the bolt thrust of an 80,000 PSI cartridge; standard AR-10 bolts may experience premature lug shearing if subjected to constant hybrid-case pressures.

Best Sources For .277 Fury Reloading Data

The strongest and most authoritative sources for safe .277 Fury load development currently include:

• SAAMI (Sporting Arms and Ammunition Manufacturers’ Institute): Provides the official, definitive engineering drawings, chamber dimensions, and dual-pressure limits (65,000 PSI and 80,000 PSI) for the cartridge.
• SIG Sauer: The creator of the cartridge. Their published factory ammunition ballistics serve as the current baseline for velocity expectations.
• Hodgdon and Hornady (Pending): Major publishers are actively testing the .277 Fury and will serve as the definitive sources for exact powder charge weights upon the release of their upcoming manual updates.

Common .277 Fury Reloading Data Questions

Where can I find .277 Fury reloading data?

Baseline factory specifications are available from SAAMI and SIG Sauer. Exact powder charge tables are currently pending laboratory release from major manual publishers like Hodgdon and Hornady.

What is the maximum pressure for the .277 Fury?

The cartridge has two distinct pressure limits: 65,000 PSI for standard all-brass cases, and 80,000 PSI exclusively for SIG’s stainless-steel-based hybrid cases.

What bullet weights have .277 Fury reloading data?

Baseline data covers 113-grain monolithic military bullets, 135-grain target bullets, and heavy 150-grain to 155-grain hunting and match projectiles.

What is the best source for .277 Fury reloading data?

Currently, SAAMI provides the only authoritative safety guidelines regarding chamber pressure and overall cartridge length.

Why does .277 Fury reloading data vary between sources?

Variations occur primarily because independent reloaders are using standard 65,000 PSI brass cases, which yield significantly lower velocities than the 80,000 PSI hybrid cases used in factory military ammunition.

Does barrel length affect .277 Fury velocity?

Yes. While the cartridge achieves 3,000 fps from a 16-inch barrel using 80,000 PSI hybrid cases, utilizing a 24-inch bolt-action barrel will push those velocities even higher.

Can I load standard brass cases to 80,000 PSI?

No. Attempting to load standard brass cases to 80,000 PSI will result in catastrophic case head failure and firearm destruction.

What is the difference between starting and maximum published load data?

The starting load is the safe baseline for working up a new recipe. The maximum load is the absolute highest pressure limit established safely by a ballistic laboratory.

Where can I find pressure-tested .277 Fury data?

Pressure-tested factory baselines are established by SIG Sauer and SAAMI. Handloaders should monitor the Hodgdon Reloading Data Center for upcoming powder charge releases.

Does Hodgdon publish .277 Fury reloading data?

Hodgdon is currently in the process of laboratory testing the .277 Fury, and official data will be published in their Data Center once finalized.

Does Hornady publish .277 Fury reloading data?

Upcoming editions of the Hornady manual are expected to include 65,000 PSI .277 Fury data for their .277-inch projectiles.

Can I make .277 Fury brass from .308 Winchester?

While the parent case dimensions are nearly identical, necking down .308 Winchester brass will result in a standard brass case that MUST be kept to standard 62,000 – 65,000 PSI limits, completely incapable of matching the 80,000 PSI factory hybrid loads.