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577 t-rex go BOOM!

The .577 Tyrannosaur or .577 T-Rex (14.9×76mm) is a very large and extremely powerful rifle cartridge developed by A-Square in 1993 for professional guides who 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 (14.9 mm) diameter 750-grain (49 g) Monolithic Solid Projectile which when fired moves at 2,460 ft/s (750 m/s) producing 10,180 foot-pounds force (13,800 J) of muzzle energy. The production model from A-square is based on their Hannibal rifle.

The first question anyone asks about the .577 is ‘What is the recoil like?’ To find out—since neither of us had ever fired one—we took a Tyrannosaur to a range in Kentucky and let fly. Shooting it offhand, with a firm grip, each of us was rocked onto his back foot, but nothing was dislocated and (lurid Internet videos to the contrary) we were neither thrown across a room nor through a window. A quick second shot would be difficult though. Fitted with Art’s Coil-Check stock, the rifle itself weighed 13 pounds. The stock was so large, it was difficult to hold onto—shooting the gun was like fencing with a railroad tie—and I would hate to have to stalk a dangerous animal with the rifle at the ready.”—Terry Wieland, Dangerous Game Rifles, from the chapter “Cartridges for Bolt Actions.”

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