The Weatherby 25 WBY RPM 117gr Hornady SST load is a box of 20 rounds of 25 Weatherby RPM hunting ammunition built on premium brass (Weatherby part no. H25RPM117SST). The 25 Weatherby RPM follows the design philosophy of the 6.5 and 338 RPM cartridges: a rebated precision magnum case that fits a lighter, more compact rifle without giving up velocity or downrange capability. The Hornady SST (Super Shock Tip) expands quickly and reliably, particularly at higher velocities, and Weatherby describes it as a flat-shooting, accurate bullet for whitetails and most North American game from antelope to moose. Weatherby publishes a muzzle velocity of 3,150 fps and 2,577 ft-lbs of muzzle energy for this 117-grain load, still carrying 2,005 fps at 500 yards. Weatherby lists a 2026 production start for the cartridge.

Key Specifications

• The cartridge is 25 Weatherby RPM, a rebated precision magnum in 25 caliber built for the lightweight Mark V 6-Lug action.
• Bullet weight is 117 grains, the load weight Weatherby lists for this part number.
• The bullet is the Hornady SST, and quick, reliable expansion at speed is what the Super Shock Tip is built for.
• The G1 ballistic coefficient is .390, a measure of how well the bullet resists drag as it flies.
• Muzzle velocity is 3,150 fps from Weatherby published ballistics, which sets the flatness of the trajectory.
• Muzzle energy is 2,577 ft-lbs, the starting point for the energy the bullet delivers downrange.
• Box quantity is 20 rounds, a standard count for sighting in and a hunting trip.

Frequently Asked Questions

What bullet does this 25 WBY RPM load use? It uses a 117-grain Hornady SST. The Hornady SST (Super Shock Tip) expands quickly and reliably, particularly at higher velocities, and Weatherby describes it as a flat-shooting, accurate bullet for whitetails and most North American game from antelope to moose.

What velocity and energy does this load publish? Weatherby lists 3,150 fps and 2,577 ft-lbs at the muzzle, falling to 2,654 fps and 1,830 ft-lbs at 200 yards and 2,005 fps and 1,044 ft-lbs at 500 yards.

What is the 25 WBY RPM cartridge? The 25 Weatherby RPM follows the design philosophy of the 6.5 and 338 RPM cartridges: a rebated precision magnum case that fits a lighter, more compact rifle without giving up velocity or downrange capability. Weatherby lists a 2026 production start for the cartridge.

Buy the Weatherby 25 WBY RPM 117gr Hornady SST Rifle Ammunition, 20-Round Box

Weatherby builds this 25 WBY RPM load around a 117-grain Hornady SST so the cartridge performs the way its design intends. Order it from Weatherby‘s selection of rifle ammunition through our Lubbock, Texas gun shop for fast, insured shipping.