.30-378 WBY Mag Ammo

The .30-378 Weatherby Magnum is a high-powered, large-caliber rifle cartridge that was developed by Roy Weatherby in 1996. The cartridge is based on the .378 Weatherby Magnum case, necked down to accept a .30 caliber (7.62mm) bullet. Designed to provide exceptional long-range performance, the .30-378 WBY Mag is known for its high velocities, flat trajectories, and impressive energy, making it a popular choice for long-range hunting and precision shooting applications.


The .30-378 WBY Mag typically features bullet weights ranging from 165 to 220 grains, with muzzle velocities that can exceed 3,500 feet per second for lighter bullets, and around 3,000 feet per second for heavier projectiles. These high velocities contribute to the cartridge’s flat trajectory, allowing it to maintain accuracy and energy at extended ranges. The .30-378 WBY Mag is capable of taking down a wide variety of game, from medium-sized animals like deer and antelope, to larger species such as elk, moose, and bear.

One of the key advantages of the .30-378 WBY Mag is its inherent accuracy, which can be attributed to the cartridge’s design and the high-quality components used in Weatherby factory-loaded ammunition. However, it is important to note that the cartridge’s high performance comes with increased recoil and muzzle blast, which may be a consideration for some shooters.

The .30-378 Weatherby Magnum is best suited for experienced shooters and hunters who require a high-powered, accurate cartridge for long-range applications. Its performance characteristics make it an excellent choice for those seeking a versatile round capable of tackling a wide range of hunting scenarios and game species.

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