.577 Tyrannosaur
The .577 Tyrannosaur or .577 T-rex is a type of cartridge
Cartridge (firearms)
A cartridge, also called a round, packages the bullet, gunpowder and primer into a single metallic case precisely made to fit the firing chamber of a firearm. The primer is a small charge of impact-sensitive chemical that may be located at the center of the case head or at its rim . Electrically...

 developed by A-Square
A-SQUARE COMPANY, LLC is a manufacturer of rifles, ammunition and bullets based in Chamberlain, South Dakota in the United States. The company is one of 19 that are members of the Sporting Arms and Ammunition Manufacturer's Institution. The company's focus is on its firearms for hunting large...

 in 1993 for big game hunting
Trophy hunting
Trophy hunting is the selective hunting of wild game animals. Although parts of the slain animal may be kept as a hunting trophy or memorial , the carcass itself is sometimes used as food....

 in Africa. The .577 contains a 0.585 inches (14.9 mm) diameter 750 gr Monolithic Solid Projectile which when fired moves at 2460 ft/s (749.8 m/s) producing 10180 ft.lbf of muzzle energy
Muzzle energy
Muzzle energy is the kinetic energy of a bullet as it is expelled from the muzzle of a firearm. It is often used as a rough indication of the destructive potential of a given firearm or load...

. The production model from A-square is based on their Hannibal rifle platform. This cartridge has the distinction of possessing the heaviest free recoil of all commercially available, shoulder-fired weapons, at 220 lbs into the shoulder with its heaviest solid of 750 grains. The larger caliber, .700 Nitro Express
.700 Nitro Express
The .700 Nitro Express is a big game rifle cartridge made by Holland & Holland, London, England. It was developed in 1988 by Jim Bell and William Feldstein and built by H&H. Feldstein had tried unsuccessfully to get H&H to build a .600 Nitro Express for him, but they had already ceased production...

, drives a 1,000 grain solid at 8,900 foot-pounds, with free recoil of 200 lbs into the shoulder.

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