Came across this today..
The .577 Tyrannosaur or .577 T-Rex (14.9×76mm) 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 (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.[1] The production model from A-square is based on their Hannibal rifle platform.
The .577 Tyrannosaur or .577 T-Rex (14.9×76mm) 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 (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.[1] The production model from A-square is based on their Hannibal rifle platform.
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