Cartridge comparison
.25 Weatherby RPM vs .257 Ackley Improved
.25 Weatherby RPM and .257 Ackley Improved are both in the reference; see the full spec comparison below.
Side by side
| .25 Weatherby RPM | .257 Ackley Improved | |
|---|---|---|
| Type | Rifle | Rifle |
| Introduced | 2026 | 1945 |
| Bullet diameter | 0.257″ | 0.257″ |
| Case length | 2.4″ | 2.3331″ |
| Max pressure | 65,000 psi | 54,000 psi |
| Recoil | 17.8 ft·lb | 9–13 ft·lb |
| Effective range | 500 yd | 400 yd |
Highlighted cells hold the clear edge where both sides have a number. Every figure is a range maximum from the reference; typical loads run lower.
Case profiles, to scale
Drawn to the same scale, so the proportions are true. Physical size varies with your screen.
