Rifle · Obsolete / Non-standard
.297/250 Rook
British rook rifle cartridge — .297 case necked to accept a .250 bullet.
- Caliber
- 0.2535″ · 6.44 mm
- Introduced
- 1880
- Case
- Rimmed
- Primary use
- hunting
- Status
- Obsolete
- Introduced
- 1880
- Type
- Rifle
- Origin
- United Kingdom
- Inventor
- Various British
- Manufacturer
- British gunsmiths / various
- Standard
- Obsolete / Non-standard
- Status
- Obsolete
- Availability
- Antique
- Case capacity
- 9 gr H₂O
- Twist (typical)
- 1:14
- Primer
- Large Rifle
- Case type
- Rimmed
- Max pressure
- 18,000 psi
- Eff. range
- 100 yd
- Recoil
- 12–18 ft·lb
- Subsonic
- Capable
Ballistics
Published velocity/energy data isn't available for .297/250 Rook — an obsolete/collector cartridge.
Performance
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
Wikipedia · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 6.44 | 0.254 | ~ |
| Neck ⌀ | 6.75 | 0.266 | · |
| Shoulder ⌀ | 7.29 | 0.287 | · |
| Shoulder angle | 7.5° | — | ~ |
| Base ⌀ | 7.54 | 0.297 | · |
| Rim ⌀ | 8.94 | 0.352 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.09 | 0.043 | · |
| Neck length | 5.50 | 0.217 | ≈ |
| Case length | 20.63 | 0.812 | · |
| Overall length | 28.26 | 1.113 | · |
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. .297/250 Rook is highlighted below.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
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
Another British rook rifle cartridge, featuring a larger case than the .255 Rook while maintaining similar ballistics. Used in the classic British rook rifles for estate vermin control. The tradition of rook shooting with specialized rifles died out as rimfire cartridges became practical for the same purpose.
FAQs
- What twist rate does .297/250 Rook use?
- .297/250 Rook typically uses a 1:14 twist rate.
- What bullet diameter is .297/250 Rook?
- .297/250 Rook uses a 0.2535″ (6.44 mm) diameter bullet.
- Is .297/250 Rook still in production?
- .297/250 Rook is obsolete; typical availability is antique.
- What is .297/250 Rook used for?
- .297/250 Rook is primarily used for hunting.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 2 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →