HSM supplies this ammunition under the GameKing designation for the .300 Weatherby Magnum with a 150-grain projectile. The load is presented in consumer retail packaging suitable for field use and large-game applications. Packaging is sold per box and can be ordered in case quantities by purchasing the required number of boxes.
Packaging
Box: Sold per box containing 20 rounds. Case: Case quantity is achieved by ordering 20 boxes (for a total of 400 rounds per case based on provided box and case counts).
Key Specifications
- Caliber: .300 Weatherby Magnum.
- Bullet weight: 150 grains.
- Manufacturer: HSM.
- Model designation: GameKing.
- Cartridges per box: 20.
- Boxes per case: 20.
- Rounds per case (calculated): 400.
- Reloadable: Yes.
- Dimensions (packaging): 1.45 x 3.95 x 6.70 inches.
This offering provides a consistent factory load in .300 Weatherby Magnum packaged for retail and bulk purchase. The combination of the specified projectile weight and Weatherby-magnum case capacity makes this suitable for experienced shooters pursuing extended-range and large-game field work where magnum performance is required. Review the notes for a bullet-type data discrepancy flagged for verification.
Product information is supplied by the manufacturer and/or distributor and may be automatically formatted or enhanced using AI for clarity and consistency. While we strive for accuracy, specifications, features, and included items may change without notice. Always verify details using the manufacturer’s official documentation and the information shown on this product page before purchase or use.




