Cartridge comparison
.303 British vs .303 Magnum
.303 British and .303 Magnum are both in the reference; see the full spec comparison below.
Side by side
| .303 British | .303 Magnum | |
|---|---|---|
| Type | Rifle | Rifle |
| Introduced | 1889 | 1919 |
| Bullet diameter | 0.3118″ | 0.312″ |
| Case length | 2.222″ | 2.35″ |
| Max pressure | 49,000 psi | 48,000 psi |
| Recoil | 16–22 ft·lb | 18–25 ft·lb |
| Effective range | 600 yd | 1000 yd |
| SAAMI | 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.
