Except for the Giant 1859 28mm Remington revolver, the Zeliska may be the largest handgun in the world, weighing in at 6.001 kilograms (13.230 lb) and having a length of 55 centimetres (22 in).
The Zeliska is one of the most powerful handguns in the world, producing a muzzle energy of 4,592 foot pounds (by comparison, a 14" revolver chambered in the .500 Bushwhacker cartridge achieves approximately 10% greater power, firing a 310 grain bullet at 2,714 ft/s for 5,071 ft. lbs.
The capacity of a Zeliska is five .600 Nitro Express or .458 Win Mag rounds.
The Zeliska fires a 900 grain (58.32 g) .600 Nitro Express slug at 1,516 ft/s (462 m/s, 1,663.2 km/h), compared to the 1,850-2,050 ft/s regulation level velocities typical of 28” barrel rifles chambered in the cartridge.
Each .600 Nitro Express round costs $40, making this gun very expensive to fire.