.600 Overkill

.600 Overkill
Type	Hunting, Rifle
Place of origin	United States
Production history
Designer	Robert Garnick
Specifications
Parent case	None
Case type	Belted, straight
Bullet diameter	.620 in (15.7 mm)
Neck diameter	.646 in (16.4 mm)
Shoulder diameter	.646 in (16.4 mm)
Base diameter	.656 in (16.7 mm)
Rim diameter	.640 in (16.3 mm)
Rim thickness	.060 in (1.5 mm)
Case length	3.00 in (76 mm)
Overall length	3.65 in (93 mm)
Case capacity	196.6 gr H2O (12.74 cm3)
Primer type	Magnum Large Rifle
Ballistic performance
Bullet weight/type Velocity Energy 900 gr (58 g) FMJ up to 2450 Fps up to 11995 Ft. Lbs. Or 16172 Joules
Source(s): 470MBogo

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

Design

The .600 Overkill was designed by Robert Garnick of Las Vegas, Nevada, USA. The case is based on the .600 Nitro Express, 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 be the largest bullet that was able to fit in the CZ-550, and was designed specifically for the purpose of elephant hunting. The CZ-550 is able to fit 2 cartridges, with slight alterations. The .600 Overkill fires a 900-grain (58 g) bullet at more than 2,400 ft/s (730 m/s),