Wikipedia is usually ok for this stuff but was very limited for this cartridge.
The .577 Tyrannosaur or .577 T-Rex (14.9×76mm) is a cartridge developed by 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.
Fair enough in theory I suppose, but still wildly overpowered? Everyone's probably seen the video of the guys firing this and just about all of them literally get knocked on their asses.
Anyone know of places where this was actually adopted for use? Wondering if it was just a publicity stunt more than anything else?