Rifle · Not SAAMI standardized · Not standardizedObsolete
.375 Nitro Express 2 1/2" Velopex
.375 Nitro Express 2 1/2" Velopex is a rimmed straight-walled rifle cartridge of United Kingdom origin.
- Caliber
- 0.375″ · 9.525 mm
- Introduced
- 1899
- Case
- Rimmed
- Primary use
- Hunting
- Status
- Obsolete
- Obsolete
- Obsolete
- Introduced
- 1899
- Type
- Rifle
- Origin
- United Kingdom
- Inventor
- Holland & Holland
- Manufacturer
- Holland & Holland
- Standard
- Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Obsolete
- Availability
- Collector
- Case capacity
- 70.7 gr H₂O
- Twist (typical)
- 1:12
- Primer
- Large Rifle Magnum
- Case type
- Rimmed
- Max pressure
- 38,000 psi, CIP transducer
- Eff. range
- 250 yd
- Max range
- 1250 yd
- Recoil
- 21.1 ft·lb
Introduced by Holland & Holland
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .375 Nitro Express 2 1/2" Velopex, 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 ⌀ | 9.53 | 0.375 | · |
| Neck ⌀ | 10.08 | 0.397 | · |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 11.58 | 0.456 | · |
| Rim ⌀ | 13.28 | 0.523 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.53 | 0.060 | |
| Neck length | n/a | ||
| Case length | 63.50 | 2.500 | · |
| Overall length | 78.74 | 3.100 | · |
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. .375 Nitro Express 2 1/2" Velopex 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
Introduced around 1899.
FAQs
- What twist rate does .375 Nitro Express 2 1/2" Velopex use?
- .375 Nitro Express 2 1/2" Velopex typically uses a 1:12 twist rate.
- What bullet diameter is .375 Nitro Express 2 1/2" Velopex?
- .375 Nitro Express 2 1/2" Velopex uses a 0.375″ (9.525 mm) diameter bullet.
- Is .375 Nitro Express 2 1/2" Velopex still in production?
- .375 Nitro Express 2 1/2" Velopex is obsolete; typical availability is collector.
- What is .375 Nitro Express 2 1/2" Velopex used for?
- .375 Nitro Express 2 1/2" Velopex 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 →
