• Source: 20/577 Alexander Henry

The 20/577 Alexander Henry, also known as 20/577 Express, is an obsolete rifle cartridge.




Overview


The 20/577 Alexander Henry was developed and introduced by the Scottish gunmaker Alexander Henry around 1895 exclusively for his hunting rifles.
The 20/577 Alexander Henry is a rimmed, bottlenecked centerfire rifle cartridge. The 20/577 Alexander Henry is derived from brass 20 bore cartridges necked down to accept a .584 in (14.8 mm) calibre bullet like the .577 Black Powder Express.
The 20/577 Alexander Henry fired a 560 or 570 gr (36 or 37 g) lead, paper patched bullet driven by 6 drams (10.6 g) of blackpowder at 1,725 ft/s (526 m/s), its ballistic performance replicating that of the .577 Black Powder Express 3-inch. Later versions were loaded with mild loadings of cordite, carefully balanced through trial to replicate the ballistics of the blackpowder version, a copper-tubed lead bullet was also available, offering improved performance against dangerous game.




See also


Express cartridges
List of rifle cartridges
13 mm caliber




References






External links


Royal Armouries, "Centrefire rifle proof cartridge - .577 in Henry by Eley (1900)", collections.royalarmouries.org, retrieved 17 July 2018.

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