The 25 RPM follows the same design philosophy that made the 6.5 and 338 RPM such a standout performer. RPM stands for rebated precision magnum, a modern case design built to maximize performance in the lightweight Mark V 6 lug action. The idea is simple, create a magnum level cartridge that fits in a lighter, more compact rifle without sacrificing velocity or downrange capability.
CARTRIDGE SPECS
Bullet Diameter: .257 (6.35mm)
Common Reference: 25 Caliber
Max Case Length: 3.34”
Production Start: 2026
The 25 RPM uses a large body diameter, low body taper, and a 35 degree shoulder. This modern case shape increases case capacity and improves overall cartridge efficiency, allowing the 25 RPM to push higher velocities than other 25 caliber options on the market.
By slightly shortening and modifying our proven 6.5 and 338 RPM case, we optimized the overall length for high BC, heavy for caliber bullets. These longer, more stable bullets are exactly where the 25 RPM shines, delivering incredible down range velocity, energy, and terminal performance.
The result is the most advanced 25 caliber cartridge available today, offering true magnum performance from the lightweight Mark V 6 lug platform while giving hunters and shooters mild recoil, flatter trajectories, harder hits, and better downrange consistency than any 25 caliber that has come before it.
Cartridge - 25 Weatherby RPM
Best Use - Hunting
Grain Weight - 133 Grains
Quantity - 20 Round
Muzzle Velocity - 3000 Feet Per Second
Muzzle Energy - 2657 Foot Pounds
Bullet Style - Jacketed Hollow Point
Bullet Brand And Model - Berger Elite Hunter
Lead Free - No
Case Type - Brass
Primer - Boxer
Corrosive - No
Reloadable - Yes
G1 Ballistic Coefficient - 0.613
Velocity Rating - Supersonic
Country of Origin - United States of America
