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Common uses: Dangerous Game, Big Game
| Type | rifle (centerfire) |
| Typical load | 300gr Remington Premier Swift A-Frame Pointed Soft Point |
| Muzzle velocity | 2760 fps |
| Muzzle energy | 5076 ft-lb |
| Published G1 ballistic coefficient | 0.325 |
| Case length | 72 mm |
| Overall length | 95 mm |
| Range (yd) | Velocity (fps) | Energy (ft-lb) | Drop (in) |
|---|---|---|---|
| 0 | 2760 | 5073 | -1.5 |
| 100 | 2481 | 4100 | 0 |
| 200 | 2219 | 3280 | -4.2 |
| 300 | 1974 | 2596 | -15.4 |
| 400 | 1747 | 2032 | -35.7 |
| 500 | 1539 | 1577 | -67.4 |
At 1,000 yards, .375 Ultra Mag (300gr at 2760 fps, 100 yd zero, standard conditions) has a modeled come-up of about 51.5 MOA / 15.0 MIL, retaining 953 fps (subsonic).
| Range (yd) | Velocity (fps) | State | Drop (in) | Elev (MOA) | Elev (MIL) |
|---|---|---|---|---|---|
| 300 | 1974 | Supersonic | -15.4 | 4.9 | 1.43 |
| 400 | 1747 | Supersonic | -35.7 | 8.5 | 2.48 |
| 500 | 1539 | Supersonic | -67.5 | 12.9 | 3.75 |
| 600 | 1357 | Supersonic | -113.8 | 18.1 | 5.27 |
| 700 | 1206 | Transonic | -179.3 | 24.5 | 7.11 |
| 800 | 1093 | Subsonic | -268.6 | 32.1 | 9.33 |
| 900 | 1013 | Subsonic | -386.9 | 41.1 | 11.94 |
| 1000 | 953 | Subsonic | -539.2 | 51.5 | 14.98 |
Extended predictions beyond 500 yards are modeled from the same G1 engine — useful for initial DOPE, but outside the 500-yard manufacturer-table validation audit. Confirm with observed DOPE, especially near transonic.
A retained-energy reference only — not a shoot/don't-shoot distance. Real effective range depends on your accuracy, shot placement, bullet construction, and conditions. The ~1,000 ft-lb (deer-sized) and ~1,500 ft-lb (elk-sized) figures are commonly cited rules of thumb, not standards.
Your barrel, ammunition lot, and conditions will differ — always verify against the manufacturer's data and your own rifle.
The .375 RUM is a hard-hitting dangerous-game and large big-game round known for pushing heavy .375 bullets faster than the classic .375 H&H, giving it a flatter trajectory and greater retained energy at distance. With 300-grain loads it delivers well over 5,000 ft-lbs at the muzzle, enough for the largest and most dangerous game where deep penetration and stopping power matter. Its main drawbacks are heavy recoil, a healthy appetite for powder, and a comparatively limited selection of factory ammunition, which has kept it a niche choice next to the far more established .375 H&H. It doubles capably on large plains game and heavy North American game such as the big bears.
Remington introduced the .375 Remington Ultra Magnum (.375 RUM) in 2000 as part of its beltless Ultra Magnum family, whose case design derives from the large-capacity .404 Jeffery. It was engineered to deliver .375-caliber performance meeting or exceeding the venerable .375 H&H Magnum, and it extended the Ultra Magnum concept of higher case capacity and velocity into the heavy dangerous-game class.
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