Sheridan, WY – January 7, 2026. Weatherby continues to lead the industry in cartridge innovation with the introduction of the 25 WBY RPM (Rebated Precision Magnum) the newest addition to the RPM family. Designed to deliver true magnum performance from lightweight, compact rifles, the 25 RPM reinforces Weatherby’s position at the top of the mountain for quarter-bore cartridges.
Weatherby has always been known for pushing velocity, energy, and ballistic efficiency beyond what shooters expect. With the 25 RPM, that legacy continues. Built on the same proven design philosophy as the 6.5 RPM and 338 RPM, the 25 RPM is engineered specifically for the Mark V 6 lug action, delivering exceptional performance without the weight and length of a traditional magnum platform.
At the heart of the 25 RPM is a modern case design featuring a rebated rim, minimal body taper, and a 35-degree shoulder. This geometry increases usable case capacity while improving efficiency and consistency. By slightly shortening and refining the proven RPM case design, Weatherby optimized overall cartridge length to support today’s heavy for caliber, high BC bullets without compromise.
The result is a cartridge that thrives with fast twist rates (1:7.5) and long, sleek projectiles. The 25 RPM is capable of pushing a 133 gr Berger at 3,000 feet per second, delivering flatter trajectories, higher retained energy, and superior downrange performance compared to legacy quarter-bore cartridges. When compared to popular alternatives like the 25 Creedmoor, 25-06, and 257 Roberts, the 25 RPM offers a clear ballistic advantage.
“It’s been 80 years since my grandfather introduced his favorite cartridge, the 257 Wby Mag. Rather than updating the all-time “King of the Quarter Bore”, we felt it was fitting to introduce the 25 WBY RPM alongside Roy’s favorite cartridge with the purposeful intent of loading heavy for caliber bullets that are now so readily available. The end result will be an unstoppable pair of 25’s!” -Adam Weatherby, CEO Weatherby Inc
Versatility is another defining feature of the 25 RPM. While it excels with heavy, high BC bullets for long-range hunting, it is equally capable of spinning lighter projectiles at speeds exceeding 3300 feet per second. This balance makes the 25 RPM an ideal choice for hunters seeking a do-it-all quarter-bore cartridge that performs across a wide range of game.
At launch, factory ammunition will be offered in multiple configurations, including a 133 gr Berger, 117 gr Barnes LRX, 117 gr Hornady SST, and 107 gr Tipped Hammer HCB. Brass will be available for reloaders.
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