The .577 Tyrannosaur or .577 T-Rex is a very large and extremely powerful rifle cartridge developed by American A-Square in 1993 for professional guides that escort clients hunting dangerous game. The cartridge is designed for use in "stopping rifles": A rifle intended to stop the charge of dangerous game. The 577 contains a .585-inch diameter 750-grain Monolithic Solid Projectile which when fired moves at 2,460 ft/s producing 10,180 foot-pounds force of muzzle energy. The production model from A-square is based on their Hannibal rifle platform.


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