Cartridge comparison
.45 ACP vs .455 Webley Mk II
.45 ACP and .455 Webley Mk II are both in the reference; see the full spec comparison below.
Side by side
| .45 ACP | .455 Webley Mk II | |
|---|---|---|
| Type | Pistol | Revolver |
| Introduced | 1905 | 1912 |
| Bullet diameter | 0.452″ | 0.4555″ |
| Case length | 0.898″ | 0.7677″ |
| Max pressure | 21,000 psi | 13,000 psi |
| Recoil | 7.8–9 ft·lb | 7.6–9.3 ft·lb |
| Effective range | 50 yd | 50 yd |
| SAAMI | SAAMI standardized | Not SAAMI standardized |
| CIP | CIP 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.
