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The .577 Tyrannosaur or .577 T-Rex (14.9×76mm) is a very large and powerful rifle cartridge developed by A-Square in 1993 on request for professional guides in Zimbabwe who escort clients hunting dangerous game. The cartridge is designed for use in "stopping rifles" intended to stop the charge of dangerous game.
The .577 Nitro Express is a large-bore centerfire rifle cartridge designed for the purpose of hunting large game such as elephant. This cartridge is used almost exclusively in single-shot and double express rifles for hunting in the Tropics or hot climates in general and is a cartridge associated with the golden age of African safaris and Indian shikars.
Available calibers for A-Square firearms range from those designed for large, dangerous game, including the .577 T-Rex and .416 Taylor, through smaller-caliber .243 Win rifles. A-Square held the patent 4811666 for the monolithic solid bullet. [7]
The .577 Black Powder Express was the go-to dangerous game caliber from the 1870s through 1900. It spawned the .577 Express around 1890, which used smokeless cordite instead of black powder, and then the .577 Nitro Express in 1900, which used modern metal jacketed and solid bullets pushed by more modern smokeless powders.
.577 Tyrannosaur, a type of cartridge developed by A-Square in 1993 for big game hunting in Africa.577/450 Martini–Henry, a black powder, centerfire round used by the British and British Empire militaries.577 Snider, an obsolete cartridge produced around 1867 and replaced in service by the .577/450 Martini–Henry cartridge
The rifles are ruggedly build to perform well with hard recoiling cartridges such as the .460 Weatherby Magnum, .500 A-Square, .577 Tyrannosaur. [37] Dumoulin Herstal of Belgium manufactures rifles for the cartridge in their proprietary A2000/LM Long Magnum Mauser action White Hunter rifle line.
Robert "Bobby" Cavanaugh, of Madison Heights, Michigan, was beaten to death on Christmas Eve after he tried to save a dog who was being abused by a neighbor and alleged repeated felon, witnesses said.
The .577/500 NE was developed by loading a 3 + 1 ⁄ 8-inch variant of the .577/500 Black Powder Express with smokeless cordite. The latter was developed by necking down the .577 Black Powder Express to .508". [2] Whilst very similar to the .577/500 No 2 Black Powder Express the two are not interchangeable. [1]