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The 25 WBY RPM cartridge represents Weatherby's modern take on quarter-bore hunting, engineered to deliver magnum-class performance from a rebated-rim case that fits standard long actions. This factory ammunition takes full advantage of that design philosophy by loading Hornady's 117-grain Super Shock Tip bullet—a proven performer that combines reliable expansion with a ballistic coefficient of 0.390.
The Hornady SST is a solid choice for this cartridge. It's a copper-jacketed polymer-tip bullet that delivers consistent accuracy and terminal performance across a wide range of hunting scenarios. While other 25 RPM options like the Berger Elite Hunter offer higher ballistic coefficients for extreme-range work, the 117-grain SST strikes a balance between velocity, trajectory, and practical field performance. At 3150 fps from a 24-inch barrel, you're looking at flatter trajectories than you'd get from traditional quarter-bore loads.
This cartridge was purpose-built around modern bullet designs. The rebated rim gives you a standard 0.473-inch bolt face, meaning it functions in Weatherby's lightweight Mark V 6-lug action or the newer Model 307—both platforms known for lighter carry weight and faster handling in real hunting situations. The 35-degree shoulder and generous seating room (0.940 inches) mean you're not forced to seat this 117-grain bullet deeply or sacrifice powder capacity. Case capacity sits at 72.5 grains of water, roughly 40 percent more than the 25 Creedmoor, which translates to the velocity you'd expect from a Weatherby cartridge without needing a belted magnum design.
Twenty rounds of factory ammunition loaded to Weatherby's specifications. Reloaders should note that these are loaded to a SAAMI maximum average pressure of 65,000 psi, and the brass is currently Weatherby OEM only—worth keeping for future reloading. The cartridge is reloadable, and since 2026, published load data has been growing for common magnum powders like RL-26, Retumbo, and H1000.
The 25 RPM pushes the 117-grain Hornady SST to 3150 fps—faster than the 25 Creedmoor and competitive with much larger magnums. Unlike the older .257 Weatherby Magnum, which requires a 9-lug action, the RPM fits standard long-action bolt faces, making it more practical for lighter rifles. The fast 1:7.5-inch twist rate also lets you stabilize heavier, high-BC bullets that older quarter-bores can't handle effectively.
Yes, the brass is reloadable. Currently, Weatherby manufactures the brass, and it's becoming more widely available as demand increases. Load data for the 25 RPM is growing through 2026, particularly for slow-burning magnum powders like RL-26, Retumbo, and H1000. Weatherby also sells unprimed brass if you want to handload. Just remember that case trim length and neck annealing become important with this cartridge's sharp shoulder.
The 25 WBY RPM fires in any rifle chambered for the cartridge. Weatherby offers it in the Mark V 6-lug action—available in several models including the lightweight Backcountry Ti—and in the Model 307, Weatherby's first all-new centerfire action in over 50 years. The rebated-rim design fits standard .473-inch bolt faces, so compatibility is straightforward for Weatherby platforms.
The 117-grain SST with its 0.390 ballistic coefficient is a solid all-rounder, delivering good accuracy and reliable performance for most hunting situations. If you're specifically targeting extreme-distance work (past 700 yards), the heavier Berger Elite Hunter option (133 grains, BC 0.613) in the 25 RPM lineup will give you a trajectory advantage. The SST is the practical choice for general hunting where you're under 500 yards.
| UPC | 747115463404 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | H25RPM117SST |
| Shipping Weight | 1.266 |
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