.577 may refer to:
*
.577 Black Powder Express
The .577 Black Powder Express is a series of black powder cartridges of varying lengths including 2-inch, 2-inch, 3-inch and 3-inch.
Development
The .577 BPE originated around 1870 with the 2-inch variant.
The 3-inch cartridge has survived to ...
, a black powder, centerfire round
*
.577 Nitro Express
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 h ...
, a rimmed metallic cartridge
*
.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
The .577 Snider cartridge was a British black powder metallic rimfire cartridge, which fired a , lead projectile, primarily used in the Snider–Enfield rifle.
Early .577 Snider cartridges were made from a composite design using paper and bra ...
, an obsolete cartridge produced around 1867 and replaced in service by the .577/450 Martini–Henry cartridge
* The first three digits in the decimal expansion of the
Euler–Mascheroni constant, .57721 56649...
{{numberdis