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This Weatherby Select Plus ammunition represents a genuine collaboration between two respected names in the industry. Weatherby introduced the .338 WBY RPM cartridge in 2022 specifically to fit magnum-class firepower into their lightweight Mark V 6 Lug action without sacrificing performance. That cartridge married with Hornady's proven InterLock bullet technology creates a straightforward, purposeful hunting load.
The .338 WBY RPM was engineered from the ground up to deliver big game stopping power in a backcountry package. Its non-belted case features a large body diameter, low body taper, and a 35-degree shoulder that work together to maximize powder capacity and velocity. With an 18-inch barrel you still maintain ballistics that compete with traditional magnum rounds, while a 24-inch barrel takes performance even further. The 225-grain projectile leaving the muzzle at 2800 fps generates roughly 3917 foot-pounds of energy, which speaks to its capability on tough game.
The InterLock has been around since 1977 and remains one of the most trusted hunting bullets in the field. Its signature design features a raised ring embedded inside the jacket that mechanically locks the core and jacket together during expansion. This matters because it prevents premature separation and allows the bullet to retain mass through bone and vital organs. The exposed lead tip initiates controlled expansion even at extended ranges, and the classic cup-and-core construction delivers the balance between expansion and penetration that works across a wide velocity window.
Each box contains 20 rounds loaded in reloadable brass cases. Made in the USA, this ammunition comes ready to shoot from rifles chambered in .338 WBY RPM. The reloadable casings appeal to handloaders looking to stretch value from premium ammunition, and the consistent factory loading makes it a reliable field option for those who prefer factory loads.
This ammunition is designed for rifles chambered in .338 WBY RPM, which was introduced in 2022. Weatherby manufactures several options including the Mark V Backcountry 2.0 line in both steel and carbon barrel versions. Since this is Weatherby's proprietary cartridge, availability is limited to Weatherby rifles and custom builds. Check your rifle's chamber specification before purchasing.
The Hornady InterLock uses a mechanical ring locked inside the jacket to keep the core and jacket together during expansion, which means better weight retention and deeper penetration than standard soft points. It expands at impact velocities starting around 1700 fps, making it effective across reasonable hunting ranges. Field reports consistently show the InterLock delivers reliable expansion and pass-through performance on elk, moose, and similar-sized game.
Yes, the .338 WBY RPM uses non-belted, reloadable brass cases. After firing, you can resize, reprime, and reload these cases according to published load data. This appeals to handloaders who want to stretch the value of premium factory ammunition and fine-tune loads for their specific rifle.
The 2800 fps rating is based on a 24-inch barrel. Shorter barrels, like the 18-inch tubes on Weatherby's Backcountry 2.0 Ti, will produce slightly lower velocities but still maintain excellent performance. The .338 WBY RPM was specifically designed to be efficient with short barrels, so even 18-inch configurations deliver competitive ballistics for backcountry hunting applications.
| Caliber/Gauge | 338 WBY RPM |
|---|---|
| Case Material | Brass |
| Cost per Round | 3.50 |
| Grains | 225 gr |
| Length | 6.0500 |
| Manufacturer | |
| Manufacturer Part Number | H338225IL |
| Shipping Weight | 1.61 |
| Units per Box | 20 |
| UPC | 747115450664 |
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