Cartridge comparison
.505 Gibbs vs .577/500 No. 2 Black Powder Express
.505 Gibbs and .577/500 No. 2 Black Powder Express are both in the reference; see the full spec comparison below.
Side by side
| .505 Gibbs | .577/500 No. 2 Black Powder Express | |
|---|---|---|
| Type | Rifle | Rifle |
| Introduced | 1911 | 1879 |
| Bullet diameter | 0.5051″ | 0.507″ |
| Case length | 3.15″ | 2.83″ |
| Max pressure | 39,160 psi | 18,000 psi |
| Recoil | 75–100 ft·lb | 46–47.5 ft·lb |
| Effective range | 150 yd | 250 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.
