Cartridge comparison
.257 Ackley Improved vs 6.5x57mmR
.257 Ackley Improved and 6.5x57mmR are both in the reference; see the full spec comparison below.
Side by side
| .257 Ackley Improved | 6.5x57mmR | |
|---|---|---|
| Type | Rifle | Rifle |
| Introduced | 1945 | 1901 |
| Bullet diameter | 0.257″ | 0.2638″ |
| Case length | 2.3331″ | 2.2323″ |
| Max pressure | 54,000 psi | 47,863 psi |
| Recoil | 9–13 ft·lb | 10.7–12.3 ft·lb |
| Effective range | 400 yd | 400 yd |
| SAAMI | Wildcat | Not SAAMI standardized |
| CIP | Not standardized | CIP standardized |
| Obsolete | — | Obsolete |
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.
