.277 Fury
Introduced 2019
Also known as 6.8x51mm: the same cartridge under different names, all of which find this page.
Dimensions and pressure
Generated from the schema, like every specification table on this site, so a figure recorded on this entry cannot be missing from the table.
Identity
- Designed by
- not recorded
- Introduced
- 2019
- Production
- not recorded
- Standards body
- No standards body
- Case type
- Rimless
- Case shape
- Bottleneck
Dimensions
- Bullet diameter
- 7.06 mm0.2780 inestimated
Converted from .2780 in, via the Wikipedia infobox.
- Bore diameter
- not recorded
- Case length
- 51.18 mm2.015 inestimated
Converted from 2.015 in, via the Wikipedia infobox; the infobox carries no inline citation to a primary SIG Sauer or SAAMI datasheet.
- Overall length
- 71.76 mm2.825 inestimated
Converted from 2.825 in, via the Wikipedia infobox.
- Rim diameter
- 11.99 mm0.4720 inestimated
Converted from .4720 in, via the Wikipedia infobox.
- Neck diameter
- 7.87 mm0.3098 inestimated
Converted from .3100 in, via the Wikipedia infobox.
- Base diameter
- 11.95 mm0.4705 inestimated
Converted from .4703 in, via the Wikipedia infobox.
Pressure
- Maximum pressure
- 551.6 MPa80,003 psiestimated
Converted from a published 80,000 psi SAAMI maximum average pressure figure, via the Wikipedia infobox; no inline citation to a primary SAAMI datasheet is given.
- Pressure standard
- SAAMI
SAAMI and C.I.P. measure pressure differently and their figures are not interchangeable, which is why the body is always named beside the figure.
Loads
Velocity is recorded per barrel length as published. A gun page interpolates between these points and never projects beyond them.
113 gr Hybrid Ball
- Bullet mass
- 7.32 g113.0 grestimated
113 gr bullet, SIG Sauer factory load, via the Wikipedia infobox (no primary citation given there).
- Cartridge mass
- not recorded
- Bullet type
- Hybrid Ball
- G1 BC
- not recorded
- G7 BC
- not recorded
| Barrel | Velocity |
|---|---|
| 406.4 mm16.00 in | 975.4 m/s3,200 fps |
135 gr Brass Elite Ball
- Bullet mass
- 8.75 g135.0 grestimated
135 gr bullet, SIG Sauer factory load, via the Wikipedia infobox.
- Cartridge mass
- not recorded
- Bullet type
- Brass Elite Ball
- G1 BC
- not recorded
- G7 BC
- not recorded
| Barrel | Velocity |
|---|---|
| 406.4 mm16.00 in | 838.2 m/s2,750 fps |
135 gr Hybrid Match
- Bullet mass
- 8.75 g135.0 grestimated
135 gr bullet, SIG Sauer factory load, via the Wikipedia infobox.
- Cartridge mass
- not recorded
- Bullet type
- Hybrid Match
- G1 BC
- not recorded
- G7 BC
- not recorded
| Barrel | Velocity |
|---|---|
| 406.4 mm16.00 in | 914.4 m/s3,000 fps |
140 gr Hybrid Hunting
- Bullet mass
- 9.07 g140.0 grestimated
140 gr bullet, SIG Sauer factory load, via the Wikipedia infobox.
- Cartridge mass
- not recorded
- Bullet type
- Hybrid Hunting
- G1 BC
- not recorded
- G7 BC
- not recorded
| Barrel | Velocity |
|---|---|
| 406.4 mm16.00 in | 899.2 m/s2,950 fps |
155 gr Hybrid Match
- Bullet mass
- 10.04 g154.9 grestimated
155 gr bullet, SIG Sauer factory load, via the Wikipedia infobox.
- Cartridge mass
- not recorded
- Bullet type
- Hybrid Match
- G1 BC
- not recorded
- G7 BC
- not recorded
| Barrel | Velocity |
|---|---|
| 609.6 mm24.00 in | 914.4 m/s3,000 fps |
Chambered in
Computed from every entry that lists this cartridge. Nothing here is hand-maintained.
No entry on the site is chambered in it yet.
Detail
SIG Sauer developed this cartridge, marketed under the metric name 6.8×51mm for its military submission, for the US Army’s Next Generation Squad Weapon programme. The programme was launched over concern that improving body armour was eroding how reliably 5.56×45mm NATO rounds could defeat it, and the Army selected SIG Sauer in 2022 to build the M7 rifle and M250 automatic rifle around this round for operational testing beginning in 2024.
What makes the cartridge unusual is its case rather than its bullet diameter. Each case is a hybrid of a stainless-steel base bonded to a brass body through an aluminium locking washer, a construction chosen to survive an operating pressure well above what a conventional all-brass case is built for. That pressure (about 80,000 psi by SAAMI’s method, converted here to 551.6 MPa) is far higher than a typical rifle cartridge, and Wikipedia’s own account notes this headroom brings an increased risk of case or firearm rupture that the hybrid case and matching chamber are engineered against.
None of this entry’s dimensions carry an inline citation on the Wikipedia article that is its only source
here, so every figure is recorded as estimated rather than verified, and no primary SIG Sauer or SAAMI
datasheet has been consulted directly. No free dimensional standard exists for a cartridge this new, and
no photograph illustrates this entry.
References
- .277 Fury · 1371559167 · read 2026-09-09
Last verified 2026-09-09 · review status: agent-populated