.378 Weath. Mag.

Reloading data for .378 Weath. Mag. cartridges and specifications for cases and loads in this caliber.
Product number: CID_577
Load data for caliber ".378 Weath. Mag."
The .378 Weatherby Magnum (378 Wby Mag) is a rifle cartridge developed by Roy Weatherby in 1953. It is a belted, bottlenecked cartridge with a bullet diameter of .375 inches (9.5mm) and a case length of 2.913 inches (74mm).

The 378 Wby Mag is known for its extreme power, high velocity, and flat trajectory, making it a popular choice among long-range hunters and shooters. It is capable of firing heavy, high-BC bullets at extremely high velocities, resulting in exceptional long-range accuracy and terminal ballistics.

The cartridge is suitable for hunting the world's largest and most dangerous game, such as cape buffalo and elephant, as well as for long-range target shooting. However, due to the cartridge's high velocity and energy, it generates significant recoil, which can be challenging for some shooters to manage.

The 378 Wby Mag is typically used in rifles with strong actions and heavy barrels to handle the high pressures generated by the cartridge. Overall, the 378 Wby Mag is considered one of the most powerful and versatile cartridges for big game hunting and long-range shooting, and it has a loyal following among hunters and shooters who value its performance and reliability.

You find .378 Weath. Mag. with all common powders and bullets by clicking the 'Loads in this caliber' button above.

Technical Specifications (based on the respective safety standard - see more details in tab 'Datasheet' if available)

Caliber: .378 Weath. Mag.
Cartridge Type: Magnum
Bullet Diameter: 0.375 '' | 9.53 mm
Primer Size: Large Rifle Magnum (LRM)
Max. Case Length (l3):2.91'' | 73.99 mm
Max .Cartridge Length / OAL:3.66'' | 92.84 mm
Maximum Standardized Pressure:63817.6 psi | 4400 bar
The Commission internationale permanente pour l'épreuve des armes à feu portatives ("Permanent International Commission for the Proof of Small Arms" – commonly abbreviated as C.I.P.) is an international organisation which sets standards for safety testing of firearms. (The word portatives ("portable") in the name refers to the fact the C.I.P. tests small arms almost exclusively; it is ordinarily omitted from the English translation of the name.) As of 2015, its members are the national governments of 14 countries, of which 11 are European Union member states. The C.I.P. safeguards that all firearms and ammunition sold to civilian purchasers in member states are safe for the users.
To achieve this, all such firearms are first proof tested at C.I.P. accredited Proof Houses. The same applies for cartridges; at regular intervals, cartridges are tested against the C.I.P. pressure specifications at the ammunition manufacturing plants and at C.I.P. accredited Proof Houses.

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