.600 Overkill

The .600 Overkill is a hunting cartridge designed to fit the CZ-550 action, by American Hunting Rifles.

.600 Overkill
Type	Hunting, rifle
Place of origin	United States
Production history
Designer	Robert Garnick
Designed	2000[1]
Specifications
Parent case	None
Case type	Belted, straight
Bullet diameter	15.7 mm (0.62 in)
Neck diameter	16.4 mm (0.65 in)
Shoulder diameter	16.4 mm (0.65 in)
Base diameter	16.7 mm (0.66 in)
Rim diameter	16.3 mm (0.64 in)
Rim thickness	1.5 mm (0.059 in)
Case length	76 mm (3.0 in)
Overall length	93 mm (3.7 in)
Case capacity	196.6 cm3 (3,034 gr H2O)
Primer type	Magnum large rifle
Ballistic performance
Bullet mass/type Velocity Energy 900 gr (58 g) FMJ 2,400 ft/s 11,510 ft⋅lbf
Source(s): 470MBogo[2]

Design

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 900-grain (58 g) bullet at more than 2,400 ft/s (730 m/s),