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Weatherby introduced the .338 WBY RPM in 2022 as their 16th proprietary cartridge, solving a problem that serious backcountry hunters face: how to get .338 magnum stopping power from a 5-pound rifle. This ammunition loads a 185-grain Barnes TTSX into the rebated precision magnum case, sending it downrange at 3100 fps with 3947 foot-pounds of muzzle energy. That's the kind of velocity-to-weight ratio that makes mountain hunting a different experience.
The 185-grain TTSX is a solid copper projectile with a polymer tip that delivers two major advantages. The tip boosts ballistic coefficient for better velocity retention at distance, and it initiates expansion reliably even when impact speeds drop on longer shots. The bullet's design creates massive wound channels while maintaining the structural integrity needed for deep penetration. This matters whether you're hunting at 90 yards or trying to reach game at 400.
The .338 WBY RPM fits Weatherby's Mark V 6-lug action, the same compact platform that handles larger magnum cartridges in heavier actions. That means all of this performance comes in rifles that weigh a fraction of what traditional .338 magnums tip the scales at. Field testing by Weatherby's team proved the concept works on everything from spring bears to elk and moose at distances up to 550 yards.
This is Weatherby's premium ammunition line, built with consistent ignition, tight tolerances, and repeatable accuracy in mind. Every round uses reloadable brass cases and is loaded to deliver the velocity and terminal performance the .338 WBY RPM was designed around. It's the factory load that pairs seamlessly with Mark V rifles chambered in this cartridge.
The .338 WBY RPM uses a rebated rim design that allows magnum performance from Weatherby's standard 6-lug action instead of the heavier magnum action. This means you get comparable ballistics in rifles that weigh significantly less, which matters when you're covering terrain in the mountains or backcountry.
The TTSX is a solid copper bullet with a polymer tip that expands reliably across a wide range of velocities. It retains nearly all of its original weight through the animal, which means deeper penetration and more consistent performance on larger game compared to traditional lead-core bullets.
The 185-grain load shoots noticeably flatter due to its lighter bullet and higher velocity, making it excellent for longer-range hunting scenarios. The 225-grain option carries more energy and is better suited if you're hunting closer or prefer a heavier bullet. Choose based on your typical hunting distances and personal preference.
This ammunition is chambered for rifles specifically designed for the .338 WBY RPM, primarily Weatherby's Mark V rifles. Always verify your rifle's chamber before firing any ammunition, and consult your rifle's manual for loading recommendations.
| Caliber/Gauge | 338 WBY RPM |
|---|---|
| Case Material | Brass |
| Cost per Round | 4.90 |
| Grains | 185 gr |
| Manufacturer | |
| Manufacturer Part Number | B338185TTSX |
| Shipping Weight | 1.5 |
| Units per Box | 20 |
| UPC | 747115447268 |
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