| .300 Pegasus | |
| Origin: | United States |
| Production Date: | 1994 |
| Is Si Specs: | yes |
| Case Type: | Rimless |
| Bullet: | 7.82 |
.300 Pegasus is an American rifle cartridge which was developed in 1994.[1] It was a completely new case design with no parent case, but has approximately the same breechface diameter (14.73 mm; 0.580 in)[2] as the .378 Weatherby Magnum, but without the magnum belt. Due to this, the .300 Pegasus has a larger case capacity than the .30-378 Weatherby Magnum.
The cartridge has an impressively high velocity which makes it quite flat shooting, but estimated barrel life time is short,[3] with some estimates at around only 500 rounds. The cartridge is usually only recommended for very experienced reloaders.