Rifle · CIP
.465 H&H Magnum
Holland & Holland's answer to the British colonial ban on .450-caliber rifles.
- Caliber
- 0.4681″ · 11.89 mm
- Introduced
- 2003
- Case
- Belted
- Parent
- .378 Weatherby Magnum
- Primary use
- Hunting
- Status
- Limited
- Introduced
- 2003
- Type
- Rifle
- Origin
- United Kingdom
- Inventor
- Holland & Holland
- Manufacturer
- Kynoch / Hornady
- Standard
- CIP
- Status
- Limited
- Availability
- Specialty
- Case capacity
- 130 gr H₂O
- Twist (typical)
- 1:14
- Primer
- Large Rifle
- Case type
- Belted
- Max pressure
- 62,366 psi, CIP transducer
- Eff. range
- 100 yd
- Max range
- 4800 yd
- Recoil
- 70–95 ft·lb
Ballistics
Published velocity/energy data isn't available for .465 H&H Magnum. Parent case: .378 Weatherby Magnum.
Performance
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 ⌀ | 11.89 | 0.468 | ✓ |
| Neck ⌀ | 12.55 | 0.494 | ✓ |
| Shoulder ⌀ | 13.50 | 0.531 | ✓ |
| Shoulder angle | 5° | — | ✓ |
| Base ⌀ | 14.78 | 0.582 | ✓ |
| Rim ⌀ | 14.71 | 0.579 | ✓ |
| Belt ⌀ | 15.33 | 0.604 | ✓ |
| Rim thickness | 1.60 | 0.063 | ✓ |
| Neck length | 14.57 | 0.574 | ≈ |
| Case length | 73.50 | 2.894 | ✓ |
| Overall length | 90.00 | 3.543 | ✓ |
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. .465 H&H Magnum is highlighted below.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
Suitable powders
1 reloading powder listed for .465 H&H Magnum, fastest to slowest. Cross-reference in the finder →
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 .465 H&H Magnum
Lineage
Connected reference
History
When the British government banned .450-caliber rifles in India and Sudan in 1907, Holland & Holland — whose reputation rested partly on the .450 NE — needed an immediate replacement. The .465 H&H Magnum was the result: same bullet weight, same velocity, same energy, different bore diameter. The difference from the .450 NE is so minor that professional hunters who used both reported no practical distinction in the field. The .465 became one of H&H's most prestigious chamberings, appearing in their finest Royal double rifles. It was used extensively in the golden age of African safari hunting in the 1920s–1950s. Kynoch and Hornady still produce ammunition; H&H still chambers rifles in .465.
FAQs
- What twist rate does .465 H&H Magnum use?
- .465 H&H Magnum typically uses a 1:14 twist rate.
- What bullet diameter is .465 H&H Magnum?
- .465 H&H Magnum uses a 0.4681″ (11.89 mm) diameter bullet.
- Is .465 H&H Magnum still in production?
- .465 H&H Magnum is limited; typical availability is specialty.
- What is .465 H&H Magnum used for?
- .465 H&H Magnum is primarily used for hunting.
- What is .465 H&H Magnum based on?
- .465 H&H Magnum is derived from the .378 Weatherby Magnum case.
- What are the best powders for .465 H&H Magnum?
- Reloading powders commonly listed for .465 H&H Magnum include Reloader 25.
Sources & provenance
- Standard C.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
- Secondary .465 H&H Magnum - Wikipedia · parent_cartridge
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 18 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
