Cartridge comparison
20/577 Alexander Henry vs .577 Nitro Express 3"
20/577 Alexander Henry and .577 Nitro Express 3" are both in the reference; see the full spec comparison below.
Side by side
| 20/577 Alexander Henry | .577 Nitro Express 3" | |
|---|---|---|
| Type | Rifle | Rifle |
| Introduced | 1895 | 1900 |
| Bullet diameter | 0.584″ | 0.5839″ |
| Case length | 2.75″ | 3″ |
| Max pressure | 35,500 psi | 35,534 psi |
| Recoil | 88.4 ft·lb | 123.4–136.2 ft·lb |
| Effective range | 150 yd | 75 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.
