Home › Browse Calibers › .375 Wby. Mag.
Common uses: Dangerous Game, Big Game
| Type | rifle (centerfire) |
| Typical load | 300gr Weatherby Nosler Partition |
| Muzzle velocity | 2800 fps |
| Muzzle energy | 5224 ft-lb |
| Published G1 ballistic coefficient | 0.398 |
| Case length | 72.4 mm |
| Overall length | 92.7 mm |
| SAAMI max pressure | 65000 PSI |
| Range (yd) | Velocity (fps) | Energy (ft-lb) | Drop (in) |
|---|---|---|---|
| 0 | 2800 | 5222 | -1.5 |
| 100 | 2569 | 4396 | 0 |
| 200 | 2350 | 3679 | -3.8 |
| 300 | 2142 | 3055 | -13.9 |
| 400 | 1944 | 2518 | -31.6 |
| 500 | 1759 | 2061 | -58.5 |
At 1,000 yards, .375 Wby. Mag. (300gr at 2800 fps, 100 yd zero, standard conditions) has a modeled come-up of about 40.4 MOA / 11.7 MIL, retaining 1091 fps (subsonic).
| Range (yd) | Velocity (fps) | State | Drop (in) | Elev (MOA) | Elev (MIL) |
|---|---|---|---|---|---|
| 300 | 2142 | Supersonic | -13.9 | 4.4 | 1.29 |
| 400 | 1944 | Supersonic | -31.6 | 7.5 | 2.20 |
| 500 | 1759 | Supersonic | -58.5 | 11.2 | 3.25 |
| 600 | 1587 | Supersonic | -96.8 | 15.4 | 4.48 |
| 700 | 1431 | Supersonic | -148.8 | 20.3 | 5.91 |
| 800 | 1294 | Transonic | -218.0 | 26.0 | 7.57 |
| 900 | 1180 | Transonic | -307.9 | 32.7 | 9.50 |
| 1000 | 1091 | Subsonic | -422.8 | 40.4 | 11.74 |
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 Weatherby Magnum is a dangerous-game cartridge that wrings modestly more velocity from the classic .375-caliber belted case, delivering flatter trajectory and greater retained energy than the .375 H&H while feeding through the same standard-length magnum actions. Driving 300-grain bullets around 2,800 fps for well over 5,000 ft-lb at the muzzle, it carries the authority expected for heavy African and other large, thick-skinned game, and its extra reach makes it somewhat more versatile on plains game at distance. Heavy recoil and the practical limits of factory ammunition availability keep it a specialist's choice rather than a mainstream option. In practice its performance advantage over the ubiquitous .375 H&H is real but incremental, which is why the H&H's worldwide ammunition support has left the Weatherby version comparatively uncommon. Owners generally value it as a hard-hitting, flat-shooting alternative within the Weatherby line for hunters who want a proven .375 with a bit more velocity.
Roy Weatherby developed the .375 Weatherby Magnum in the mid-1940s (designed in 1944, in production by 1945) as one of his earlier magnum designs, formed by fire-forming the .375 H&H Magnum case to Weatherby's signature minimal-body-taper, double-radius shoulder profile. The reshaping increased powder capacity to push a standard belted case a couple hundred feet per second faster than the parent H&H at equal bullet weight. It was a proprietary Weatherby chambering rather than a wildcat, with cases and loaded ammunition eventually supplied through Norma. It was the forerunner to Weatherby's far larger .378 Weatherby Magnum, introduced in the following decade.
Run this cartridge in the ballistic calculator · Compare it against another cartridge · How this data is produced