Rifle · Not SAAMI standardized · CIP standardizedObsolete
.280 Ross
Very early high-velocity .28-caliber cartridge associated with Ross straight-pull rifles..
- Caliber
- 0.287″ · 7.29 mm
- Introduced
- 1906
- Case
- Semi-Rimmed
- Primary use
- Hunting, Target
- Status
- Obsolete
- Obsolete
- Obsolete
- Introduced
- 1906
- Type
- Rifle
- Origin
- Canada
- Inventor
- F. W. Jones (for Sir Charles Ross)
- Manufacturer
- Ross Rifle Company
- Standard
- Not SAAMI standardized · CIP standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Obsolete
- Availability
- Collector
- Case capacity
- 77.1 gr H₂O
- Twist (typical)
- 1:8.7
- Primer
- Large Rifle
- Case type
- Semi-Rimmed
- Max pressure
- 47,137 psi, CIP transducer
- Eff. range
- 500 yd
- Max range
- 4700 yd
- Recoil
- 20.2–23.6 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .280 Ross, so this is the shape gravity alone gives the advertised velocity. Drag would steepen it. The tool below solves real loads through their published G1 or G7 model.
Open in Ballistic Compare- Parent case
- —
Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
CIP TDCC · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 7.29 | 0.287 | ✓ |
| Neck ⌀ | 8.13 | 0.320 | ✓ |
| Shoulder ⌀ | 10.72 | 0.422 | ✓ |
| Shoulder angle | 26.6° | — | ✓ |
| Base ⌀ | 13.59 | 0.535 | ✓ |
| Rim ⌀ | 14.22 | 0.560 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.52 | 0.060 | ✓ |
| Neck length | 8.33 | 0.328 | ≈ |
| Case length | 66.32 | 2.611 | ✓ |
| Overall length | 87.88 | 3.460 | ✓ |
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. .280 Ross is highlighted below.
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.
Connected reference
History
Introduced 1907 (Eley); ballistics by consultant F.W. Jones. An independent pre-WWI high-velocity branch, ~3,000 fps.
FAQs
- What twist rate does .280 Ross use?
- .280 Ross typically uses a 1:8.7 twist rate.
- What bullet diameter is .280 Ross?
- .280 Ross uses a 0.287″ (7.29 mm) diameter bullet.
- Is .280 Ross still in production?
- .280 Ross is obsolete; typical availability is collector.
- What is .280 Ross used for?
- .280 Ross is primarily used for hunting, target.
Sources & provenance
- Reference Gun Digest Books (Frank C. Barnes) — Cartridges of the World (.280 Ross entry) · grain weights, bullet ⌀, velocity
- Secondary Handloader Magazine (Wolfe Publishing) — .280 Ross · velocity, bullet ⌀, grain weights, year archived
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
