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HSM Game King ammunition represents a thoughtful approach to factory hunting loads. The core of these cartridges is the Sierra GameKing bullet, a design that has earned its reputation over decades of use on everything from deer to elk. What makes HSM's Game King line stand out is the way they match each component to the bullet. The brass, primer, and powder charge all work together specifically for that GameKing design, rather than being generic components thrown together.
The 165-grain weight in a .300 RUM gives you an interesting middle ground. This caliber is known for delivering some of the flattest trajectories and hardest-hitting performance in .30 caliber hunting rifles, and the 165-grain bullet captures that power without being overkill for medium-sized game at reasonable hunting distances. The boat-tail design contributes to accurate flight and helps the bullet perform well across a range of hunting scenarios. You get the ballistic advantages of the .300 RUM without needing to go heavier than necessary.
The GameKing design is built around controlled expansion that prioritizes energy transfer over maximum penetration. This matters in real hunting situations. The bullet expands reliably and deposits its energy into the target rather than punching through without doing the job properly. Accuracy from these rounds tends to be solid, with many rifles shooting them well enough for hunting without any handload tweaking.
Every round ships in quality brass cases, which matters if you're planning to reload spent brass later. The 20-round box format is standard for hunting ammunition, giving you enough to sight in, practice, and hunt without the excess of larger boxes. If you find these work in your rifle, cases come 20 boxes per case for supply convenience.
The 165-grain GameKing in .300 RUM works well on medium to large game. At typical hunting ranges, it handles deer and elk effectively. The controlled expansion of the GameKing bullet makes it particularly good at delivering reliable performance rather than requiring extreme distances to work properly.
Yes. HSM loads these on quality brass cases that are suitable for reloading, so if you handload, you'll have usable brass after firing. This can help offset ammunition costs over time if you're planning to reload.
The 165-grain bullet is lighter than some of the heavier options available for this cartridge, meaning slightly faster velocity and flatter trajectory for shots inside typical hunting ranges. If you're planning extreme long-range work beyond 600 yards regularly, you might consider heavier bullets, but for standard hunting distances this weight works well and handles recoil a bit better than maximum magnum loads.
Yes, these are standard .300 RUM ammunition that will function in any properly chambered .300 RUM rifle. As with all ammunition, always verify that your specific rifle is chambered for .300 RUM before loading and firing.
| Caliber/Gauge | .300 RUM |
|---|---|
| Case Material | Brass |
| Cost per Round | 3.80 |
| Grains | 165 gr |
| Manufacturer | |
| Manufacturer Part Number | 300RUM12N |
| Units per Box | 20 |
| UPC | 810742023157 |
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