Cartridge comparison
.277 GS vs .280 Jeffery
.277 GS and .280 Jeffery are both in the reference; see the full spec comparison below.
Side by side
| .277 GS | .280 Jeffery | |
|---|---|---|
| Type | Rifle | Rifle |
| Introduced | 1980 | 1913 |
| Bullet diameter | 0.278″ | 0.288″ |
| Case length | 2.6378″ | 2.5″ |
| Max pressure | 63,817 psi | 47,000 psi |
| Recoil | 22.4–24.7 ft·lb | 23 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.
