The .25 Weatherby RPM (Rebated Precision Magnum) is a modern quarter-bore cartridge introduced by Weatherby around 2020, designed to deliver high-velocity .257-caliber performance from standard-size rifle actions. It is a flat-shooting option for open-country game and varmints.

The .25 Weatherby RPM is part of Weatherby's Rebated Precision Magnum family, a modern line designed to deliver magnum performance from a rebated-rim case that works in standard six-lug rifle actions rather than the larger actions classic Weatherby magnums require. The goal was magnum-class velocity in lighter, more standard rifles — a contemporary update of the Weatherby high-velocity philosophy. Ballistically the .25 Weatherby RPM drives quarter-bore (.257 caliber) bullets at high velocity, producing a flat trajectory well suited to open-country big game such as deer and pronghorn, and to varmints with lighter bullets. It revived strong interest in the quarter-bore at a time when renewed high-ballistic-coefficient .257 bullets made the bore more capable, with recoil moderate for its performance. As a newer cartridge in a proprietary family, its rifle and ammunition selection is narrower and centered on Weatherby, and shooters weigh that availability against its performance. It sits in the modern quarter-bore revival alongside cartridges like the 25 Creedmoor, distinguished by its higher-velocity magnum positioning. Today the .25 Weatherby RPM is used for open-country big-game hunting, varmint hunting, and long-range target shooting, with availability centered in Weatherby rifles and ammunition. Its combination of high quarter-bore velocity in a standard-action package is what defines its niche.

General information about this caliber — not a recommendation for this specific firearm.