From Wikipedia: The .577 Tyrannosaur or .577 T-rex is a cartridge developed by A-Square in 1993 for the hunting of large game in Africa. 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 energy.
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