Weatherby 30-378 WBY 195 gr Hammer Custom 20rd

The 30-378 Weatherby Magnum is a high-velocity magnum rifle cartridge developed by Roy Weatherby in 1959 and later reintroduced as a Weatherby production cartridge in 1996. This load uses Weatherby’s Hammer Custom bullet in a 195-grain weight and is packaged as 20 rounds per box. The cartridge is based on the .378 case necked down to .30 caliber, and it has historically been promoted for extreme long-range, high-energy performance.

Key Specifications

• The caliber is 30-378 Weatherby Magnum.
• The bullet type is Hammer Custom.
• The bullet weight is 195 grains.
• There are 20 rounds per box.
• The cartridge was originally developed in 1959 by Roy Weatherby.
• Weatherby reintroduced it as a production cartridge in 1996.
• The load lists a muzzle energy of 4503 ft·lbs.
• It was historically described as the world’s fastest 30 caliber cartridge at the time of its early publicity.

This 20-round boxed load is intended for shooters seeking a high-performance, long-range magnum cartridge in a 30-caliber configuration. The 195-grain Hammer Custom bullet provides a factory-loaded option that reflects Weatherby’s legacy of producing high-velocity magnum ammunition for precision and extended-range applications.