| .600 Overkill | |
| Origin: | United States |
| Type: | Hunting, rifle |
| Designer: | Robert Garnick |
| Design Date: | 2000[1] |
| Is Si Specs: | yes |
| Parent: | None |
| Case Type: | Belted, straight |
| Bullet: | 15.7 |
| Neck: | 16.4 |
| Shoulder: | 16.4 |
| Base: | 16.7 |
| Rim Dia: | 16.3 |
| Rim Thick: | 1.5 |
| Case Length: | 76 |
| Length: | 93 |
| Case Capacity: | 196.6 |
| Primer: | Magnum large rifle |
| Is Si Ballistics: | no |
| Bw1: | 1000 |
| Btype1: | FMJ |
| Vel1: | 2,500 ft/s (747 m/s) |
| En1: | 13,877 ft⋅lbf (18,814 J) |
| Bw2: | 1000 |
| Btype2: | Solid brass |
| Vel2: | 3,000 ft/s (914.4 m/s) |
| En2: | 19,982 ft lbs (27,092 J) |
| Balsrc: | 470MBogo |
The .600 Overkill is a hunting cartridge designed to fit the CZ-550 action, by American Hunting Rifles.
The .600 Overkill was designed by Robert Garnick of Las Vegas, Nevada in 2000. The case is a custom, with a belt, .683 in (17.35 mm), added for headspacing and the rim to fit that of the .505 Gibbs .640 in-(16.26 mm) size, bolt face.
This cartridge was intended to fire the largest bullet able to fit in the CZ-550,[2] and was designed specifically for the purpose of killing an elephant. The CZ-550 can fit two cartridges, with slight alterations. The .600 Overkill fires a 900gr bullet at more than 2400ft/s,