History
The .577 Nitro Express was descended from the .577 Black Powder Express, a cartridge invented by the late Samuel Baker who had Holland & Holland build him an express rifle in this caliber. It began as a black powder round, and then became a smokeless round. It fires a 750-grain bullet (about 48.6 grams) at a muzzle velocity of around 2050 feet per second (625 m/s). The 2.75 in. version, intended to duplicate the black powder version, launches a 650-grain bullet at more than 1,950 ft/s (590 m/s), depending on the type of powder and amount used.
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