Rifle · SAAMI
.375 Remington Ultra Magnum
The .375 Remington Ultra Magnum is the dangerous game member of the Remington Ultra Magnum family, joining the .300 RUM, .338 RUM, and 7mm RUM.
- Caliber
- 0.375″ · 9.525 mm
- Introduced
- 2002
- Case
- Rebated
- Parent
- .404 Jeffery
- Primary use
- hunting, dangerous_game
- Status
- Active
- Introduced
- 2002
- Type
- Rifle
- Origin
- United States
- Inventor
- Remington
- Manufacturer
- Remington Arms
- Standard
- SAAMI
- Status
- Active
- Availability
- Uncommon
- Primer
- Large Rifle Magnum
- Case type
- Rebated
- Max pressure
- 65,000 psi
- Eff. range
- 400 yd
- Max range
- 600 yd
Introduced by Remington Arms
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .375 Remington Ultra Magnum, 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
- .404 Jeffery
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 · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 9.53 | 0.375 | ✓ |
| Neck ⌀ | 10.29 | 0.405 | ✓ |
| Shoulder ⌀ | 13.34 | 0.525 | ✓ |
| Shoulder angle | 30° | — | ✓ |
| Base ⌀ | 13.97 | 0.550 | ✓ |
| Rim ⌀ | 13.56 | 0.534 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | — | — | |
| Neck length | 9.12 | 0.359 | ≈ |
| Case length | 72.39 | 2.850 | ✓ |
| Overall length | 91.44 | 3.600 | ✓ |
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 Remington Ultra Magnum 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.
Lineage
Connected reference
History
Introduced by Remington in 2002, the .375 RUM completed the Ultra Magnum family with a dangerous game option for hunters pursuing African or large North American game. It shares the rebated-rim case architecture of the other RUM cartridges, allowing use in a standard bolt face while providing more case capacity than the belted .375 H&H. The Remington Model 700 is the primary production rifle chambering.
FAQs
- What bullet diameter is .375 Remington Ultra Magnum?
- .375 Remington Ultra Magnum uses a 0.375″ (9.525 mm) diameter bullet.
- Is .375 Remington Ultra Magnum still in production?
- .375 Remington Ultra Magnum is active; typical availability is uncommon.
- What is .375 Remington Ultra Magnum used for?
- .375 Remington Ultra Magnum is primarily used for hunting, dangerous_game.
- What is .375 Remington Ultra Magnum based on?
- .375 Remington Ultra Magnum is derived from the .404 Jeffery case.
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 →