Rifle · Not SAAMI standardized · Not standardizedObsolete
.220 Rook
The .220 Rook (.220 Long Centrefire) is an obsolete British rimmed straight centrefire cartridge for rook rifles, firing a 30 gr .224 in bullet..
- Caliber
- 0.224″ · 5.69 mm
- Introduced
- 1884
- Case
- Rimmed
- Primary use
- Hunting
- Status
- Obsolete
- Obsolete
- Obsolete
- Introduced
- 1884
- 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
- Obsolete
- Availability
- Collector
- Case capacity
- 6.1 gr H₂O
- Twist (typical)
- 1:14
- Primer
- Small Pistol
- Case type
- Rimmed
- Max pressure
- 18,000 psi, CIP transducer
- Eff. range
- 75 yd
- Max range
- 2050 yd
- Recoil
- 0.25–0.3 ft·lb
- Subsonic
- Capable
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .220 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 ⌀ | 5.69 | 0.224 | · |
| Neck ⌀ | 6.04 | 0.238 | · |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 6.07 | 0.239 | · |
| Rim ⌀ | 7.09 | 0.279 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.09 | 0.043 | · |
| Neck length | n/a | ||
| Case length | 18.85 | 0.742 | · |
| Overall length | 23.85 | 0.939 | · |
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. .220 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.
Connected reference
History
Mentioned in an 1884 Fraser advertisement; listed in the 1899 Eley catalogue; superseded by .22 LR.
FAQs
- What twist rate does .220 Rook use?
- .220 Rook typically uses a 1:14 twist rate.
- What bullet diameter is .220 Rook?
- .220 Rook uses a 0.224″ (5.69 mm) diameter bullet.
- Is .220 Rook still in production?
- .220 Rook is obsolete; typical availability is collector.
- What is .220 Rook used for?
- .220 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 →
