Rifle · Obsolete / Non-standard
.400/375 Belted Nitro Express
Early belted Holland & Holland sporting cartridge — the first cartridge to use a belted rim..
- Caliber
- 0.375″ · 9.525 mm
- Introduced
- 1905
- Case
- Belted
- Primary use
- Hunting
- Status
- Obsolete
- Introduced
- 1905
- Type
- Rifle
- Origin
- United Kingdom
- Manufacturer
- Holland & Holland
- Standard
- Obsolete / Non-standard
- Status
- Obsolete
- Availability
- Collector
- Primer
- Large Rifle Magnum
- Case type
- Belted
- Eff. range
- 200 yd
Introduced by Holland & Holland
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .400/375 Belted Nitro Express, 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.
SAAMI · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 9.53 | 0.375 | · |
| Neck ⌀ | 10.08 | 0.397 | · |
| Shoulder ⌀ | 11.05 | 0.435 | · |
| Shoulder angle | — | — | |
| Base ⌀ | 11.94 | 0.470 | · |
| Rim ⌀ | 11.84 | 0.466 | · |
| Belt ⌀ | — | — | |
| Rim thickness | — | — | |
| Neck length | — | — | |
| Case length | 63.50 | 2.500 | · |
| Overall length | 76.20 | 3.000 | · |
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. .400/375 Belted Nitro Express is highlighted below.
Missing a dimension for .400/375 Belted Nitro Express? Some case measurements aren't in a published SAAMI/CIP drawing yet. Have a factory or reamer print? Send it → — verified hard-to-find data earns a free Lindcott sticker.
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
H&H, 1905; the belt gave correct headspacing for a highly tapered case. The entire belted-magnum lineage (incl. .375 H&H) descends from it.
FAQs
- What bullet diameter is .400/375 Belted Nitro Express?
- .400/375 Belted Nitro Express uses a 0.375″ (9.525 mm) diameter bullet.
- Is .400/375 Belted Nitro Express still in production?
- .400/375 Belted Nitro Express is obsolete; typical availability is collector.
- What is .400/375 Belted Nitro Express used for?
- .400/375 Belted Nitro Express is primarily used for hunting.
Sources & provenance
- Manufacturer Kynoch (Kynamco Ltd.) — Kynoch .400/.375 Belted Nitro Express Ammunition, 235 gr Woodleigh Weldcore (via MidwayUSA) · bullet ⌀ archived
- Reference Gun Digest Books — Cartridges of the World (Frank C. Barnes) · year, bullet ⌀, velocity, grain weights
- Secondary Cartridge Collector (cartridgecollector.net) — 400/375 Belted Nitro Express (H&H) · year, velocity, grain weights 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 →