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HSM built this .300 WSM load around the Sierra GameKing, a bullet that's been trusted by hunters for nearly five decades. The 150-grain soft-point boat-tail design does two things really well: it shoots straight and it performs on game. The boat-tail geometry improves ballistics at distance while keeping the bullet aerodynamic enough to resist wind drift and maintain velocity downrange.
HSM doesn't just throw bullets into cases. They carefully select primers and propellant to match each GameKing bullet's weight and profile, then seat everything to consistent depth in quality brass. This kind of attention to detail is why people compare these rounds to handloads fresh from a reloading bench. You get factory convenience with the precision usually reserved for custom loads.
The 150-grain GameKing sits right in the sweet spot for the .300 WSM at typical hunting velocities. From a modern short-action rifle, you're getting a muzzle velocity around 3109 feet per second, which means the bullet enters the game animal with enough energy to expand reliably without over-fragmenting. Field reports show the GameKing generates strong blood trails and quick drops on deer and similarly-sized game. The polymer tip design raises the ballistic coefficient for flatter trajectory and better long-range performance, while the exposed lead core allows predictable expansion on impact.
These rounds come in reloadable brass cases with boxer primers, so if you handload, you can get extra use from the cases after they're fired. Non-corrosive construction means your gun stays clean between shots. The .300 WSM itself is known for delivering magnum-class performance from a shorter, lighter rifle than traditional .300 Winchester Magnum platforms—making this load a practical choice for hunters who want to carry their gun deep into the field without sacrificing ballistic capability.
Yes. The 150-grain Sierra GameKing's boat-tail design and polymer tip give it a ballistic coefficient of .380, which helps it retain velocity and resist wind drift at extended distances. The .300 WSM itself is known for flat trajectories and strong downrange energy, making this combination effective for medium game hunting at longer ranges where most modern rifles can accurately shoot.
The GameKing expands reliably at typical hunting velocities and delivers strong terminal performance on medium-sized game like deer. The soft-point construction generates good blood trails and produces quick kills when shot placement is solid. Field reports over decades show consistent performance, though hunters note the GameKing is best used at standard cartridge velocities rather than at extreme speeds.
Yes. The ammunition comes in reloadable brass cases with boxer primers, making them suitable for reloading. Since HSM carefully matches components for each load, fired cases can be reloaded following standard .300 WSM handloading procedures and published load data.
This load works well for deer and similarly-sized game. The sectional density of .226 provides adequate penetration for broadside lung shots and is solid for medium-sized game at typical hunting ranges. For larger game like elk, many hunters prefer heavier bullet weights in the 165-180 grain range.
| UPC | 810742023041 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | HSM-300WSM-39-N |
| Shipping Weight | 1.5 |
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