.577 may refer to:
- .577 Black Powder Express, a black powder, centerfire round
- .577 Nitro Express, 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, 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 Euler's constant, .5772156649...
Topics referred to by the same termThis disambiguation page lists articles associated with the same number. If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: