Original British .577 Kynoch Cartridge Case

Original high-quality brass cases manufactured at the Eley-Kynoch factory in Birmingham

The .577 Snider cartridge was a British black powder metallic cartridge, which fired a 14.7-millimeter (0.577 in), 31-gram (480 gr) lead projectile, primarily used in the Snider–Enfield rifle.

Early .577 Snider cartridges were made from a composite design using paper and brass foil with a stamped metallic base and primer, much like the first generation of Martini-Henry cartridges. Later cartridges (after the design had been proved with the Martini-Henry cartridges) were made from drawn brass, much like modern small arms ammunition. The .577 Snider cartridge was eventually replaced in service by the .577/450 Martini–Henry cartridge in the 1870s. The .577 Snider cartridge is considered by most commentators to be obsolete, with large-scale commercial production having ceased in the 1930s.