HSM Ammo 300 Weatherby Magnum 165gr Sierra GameKing SBT 20 Rd - Box or Case

The HSM 300 Weatherby Magnum 165gr Sierra GameKing is a premium rifle hunting load built around the legendary .300 Weatherby Magnum cartridge. Developed by Roy Weatherby in 1944, the 300 Weatherby Magnum remains one of the most respected big-game cartridges ever produced, and this HSM offering delivers that flat-shooting performance in a reloadable, brass-cased package tailored for serious hunters.

At the heart of this load is a 165gr Sierra GameKing SBT (Spitzer Boat-Tail) Jacketed Soft Point bullet, designed for controlled expansion and deep penetration on medium to large game. With a muzzle velocity of 3,275 fps and muzzle energy of 3,931 ft lbs, this round offers flat trajectory, hard-hitting energy on impact, and the accuracy Sierra GameKing projectiles are known for. The soft-point design drives reliable expansion across a wide range of hunting distances, while the boat-tail configuration delivers improved ballistic efficiency and resistance to wind drift.

HSM loads these GameKing rounds in reloadable brass cases, making them an excellent choice for handloaders who want to save their brass after firing. Each box contains 20 rounds, and a full case holds 20 boxes (400 rounds total), giving hunters and high-volume shooters plenty of ammunition for extended trips or practice at the range.

Manufactured in the USA by HSM Ammunition, this 300 Weatherby Magnum load is engineered to perform in the demanding conditions of real-world hunting. Whether you are pursuing elk, mule deer, black bear, or other big-game species, the combination of Weatherby's flat-shooting velocity and Sierra's proven GameKing bullet makes this an excellent choice for the field.

Your purchase options:

• Box - 20 Rounds
• Case - 400 Rounds (20 Boxes)