Lindcott Armory 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
Ballistics
- 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
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Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.
Firearms chambered in .375 Remington Ultra Magnum
1 model in the database chamber .375 Remington Ultra Magnum. Browse all →
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 →