Cartridge comparison
.255 GS vs 6.5x58mm Portuguese
.255 GS and 6.5x58mm Portuguese are both in the reference; see the full spec comparison below.
Side by side
| .255 GS | 6.5x58mm Portuguese | |
|---|---|---|
| Type | Rifle | Rifle |
| Introduced | 1980 | 1904 |
| Bullet diameter | 0.2575″ | 0.264″ |
| Case length | 2.1654″ | 2.28″ |
| Max pressure | 63,817 psi | 51,488 psi |
| Recoil | 10.8–12.4 ft·lb | 10–15 ft·lb |
| Effective range | 400 yd | 400 yd |
| SAAMI | Not SAAMI standardized | Not SAAMI standardized |
| CIP | CIP standardized | Not 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.
