Cartridge comparison
.256 Newton vs 6.5x64mm
.256 Newton and 6.5x64mm are both in the reference; see the full spec comparison below.
Side by side
| .256 Newton | 6.5x64mm | |
|---|---|---|
| Type | Rifle | Rifle |
| Introduced | 1913 | 1906 |
| Bullet diameter | 0.264″ | 0.2638″ |
| Case length | 2.4402″ | 2.5197″ |
| Max pressure | 31,900 psi | 62,366 psi |
| Recoil | 16–18.2 ft·lb | 13.6–15.3 ft·lb |
| Effective range | 300 yd | 400 yd |
| SAAMI | Not SAAMI standardized | 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.
