Description
Factory brass for the 25 Weatherby RPM is the starting point every handloader wants when working up loads for Weatherby's newest quarter-bore. The 25 WBY RPM is part of the Rebated Precision Magnum family, a modern case design that packs magnum-level powder capacity into a footprint that runs in standard-size actions. If you're chambered in this round and want to build your own ammo, this is the genuine Weatherby brass to do it with.
What Makes the 25 WBY RPM Brass Worth Loading
This cartridge was designed with reloaders in mind from day one. The case uses a 35-degree shoulder for an efficient, modern shape and holds roughly 72.5 grains of water, which is about 40 percent more capacity than the 25 Creedmoor. With a 2.40-inch case length and nearly an inch of seating room, there's plenty of space to seat long, sleek, high ballistic coefficient .257 bullets without cramming into powder space. That combination is a big part of why Weatherby calls it a reloader's dream.
Spec'd for the Quarter-Bore Precision Crowd
The 25 WBY RPM carries a rebated .473-inch rim that works with standard bolt faces, built on a lengthened version of the proven .284 Winchester case head. It feeds the fast 1:7.5-inch twist barrels Weatherby built for this round, which stabilize heavy-for-caliber bullets in the 107 to 133 grain range. Running these through a Mark V six-lug or Model 307 action, handloaders can push flat, hard-hitting loads that stretch out to real long-range distances.
Reloading With Weatherby 25 WBY RPM Cases
Weatherby produces this brass to match-grade standards with CNC-machined primer pockets, so you get a clean, uniform base for developing accurate loads. Since factory 25 WBY RPM brass is still fresh to the market, having a stock of proper unprimed cases on hand makes load development a whole lot easier. Pair it with quality primers, a good powder, and the .257 bullet of your choice and you're set to tailor loads to your rifle.
Key Specifications
- Manufacturer: Weatherby
- Manufacturer Part Number: BRASS25RPM
- UPC: 747115463459
- Caliber: 25 WBY RPM
- Bullet Diameter: .257 inches (6.35mm)
- Condition: Unprimed, new brass
- Case Material: Brass
- Case Length: 2.40 inches
- Max Overall Length: 3.34 inches
- Shoulder Angle: 35 degrees
- Rebated Rim Diameter: .473 inches
- Case Capacity: 72.5 grains H2O
- Primer Pocket: CNC-machined, match-grade
- Firearm Type: Rifle
What’s Included
- Weatherby 25 WBY RPM unprimed brass cases (20 count box)
Frequently Asked Questions
Is this 25 WBY RPM brass primed or unprimed?
This is unprimed brass, meaning the cases come without primers installed. You'll supply your own primers, powder, and bullets to build complete rounds. It's made for handloaders who want to develop their own 25 WBY RPM loads from scratch.
What bullets work best in the 25 WBY RPM?
The 25 WBY RPM uses .257-inch diameter bullets and was designed for modern, heavy-for-caliber, high ballistic coefficient projectiles. The fast 1:7.5-inch twist rate in these rifles stabilizes bullets ranging roughly from 107 to 133 grains. That gives you a wide window of light to heavy options to tune for your rifle.
Why is the 25 WBY RPM called a reloader's dream?
The case was built with nearly an inch of seating room and a 35-degree shoulder, so you can seat long, sleek bullets without eating into powder capacity. It holds about 72.5 grains of water, roughly 40 percent more than a 25 Creedmoor. That extra capacity plus generous seating space makes it friendly for developing accurate, high-velocity handloads.
What rifles is the 25 WBY RPM chambered for?
Weatherby chambers this cartridge in its Mark V six-lug standard action rifles and the Model 307 platform. The rebated .473-inch rim works with standard bolt faces, built on a lengthened .284 Winchester case head. If you own a rifle chambered in 25 WBY RPM, this brass is the right starting point for your loads.





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