Cartridge comparison
.257 Ackley Improved vs 6.53 Lazzeroni Scramjet
.257 Ackley Improved and 6.53 Lazzeroni Scramjet are both in the reference; see the full spec comparison below.
Side by side
| .257 Ackley Improved | 6.53 Lazzeroni Scramjet | |
|---|---|---|
| Type | Rifle | Rifle |
| Introduced | 1945 | 1997 |
| Bullet diameter | 0.257″ | 0.257″ |
| Case length | 2.2331″ | 2.8″ |
| Max pressure | 54,000 psi | 66,718 psi |
| Recoil | 9–13 ft·lb | — |
| Effective range | 400 yd | 500 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.