Rifle · Not SAAMI standardized · Not standardizedObsolete
.300 Rook
.300 Rook is a rimmed straight-walled rifle cartridge of United Kingdom origin.
- Caliber
- 0.3″ · 7.62 mm
- Introduced
- 1874
- Case
- Rimmed
- Primary use
- Hunting
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 1874
- Type
- Rifle
- Origin
- United Kingdom
- Inventor
- Various British
- Manufacturer
- Eley Brothers; Kynoch
- Standard
- Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Rare
- Case capacity
- 17.6 gr H₂O
- Twist (typical)
- 1:12
- Primer
- Small Rifle
- Case type
- Rimmed
- Max pressure
- 18,000 psi, CIP transducer
- Eff. range
- 150 yd
- Max range
- 750 yd
- Recoil
- 0.8 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .300 Rook, 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.
Wikipedia · secondary source| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 7.62 | 0.300 | · |
| Neck ⌀ | 8.05 | 0.317 | · |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 8.10 | 0.319 | · |
| Rim ⌀ | 9.37 | 0.369 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.08 | 0.043 | |
| Neck length | n/a | ||
| Case length | 29.72 | 1.170 | · |
| Overall length | 35.05 | 1.380 | · |
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. .300 Rook 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.
Firearms chambered in .300 Rook
Connected reference
History
The .300 Rook is a straight rimmed rifle cartridge originating in United Kingdom.
FAQs
- What twist rate does .300 Rook use?
- .300 Rook typically uses a 1:12 twist rate.
- What bullet diameter is .300 Rook?
- .300 Rook uses a 0.3″ (7.62 mm) diameter bullet.
- Is .300 Rook still in production?
- .300 Rook is discontinued; typical availability is rare.
- What is .300 Rook used for?
- .300 Rook is primarily used for hunting.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
