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The 20/577 Alexander Henry, also known as 20/577 Express, is an obsolete rifle cartridge.
| 20/577 Alexander Henry | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type | Rifle | |||||||||||
| Place of origin | Scotland | |||||||||||
| Production history | ||||||||||||
| Designer | Alexander Henry | |||||||||||
| Designed | 1895 | |||||||||||
| Produced | 1895 | |||||||||||
| Specifications | ||||||||||||
| Parent case | 20 bore | |||||||||||
| Case type | Rimmed, bottleneck | |||||||||||
| Bullet diameter | .584 in (14.8 mm) | |||||||||||
| Neck diameter | .607 in (15.4 mm) | |||||||||||
| Shoulder diameter | .674 in (17.1 mm) | |||||||||||
| Base diameter | .706 in (17.9 mm) | |||||||||||
| Rim diameter | .754 in (19.2 mm) | |||||||||||
| Rim thickness | .06 in (1.5 mm) | |||||||||||
| Case length | 2.75 in (70 mm) | |||||||||||
| Overall length | 3.27 in (83 mm) | |||||||||||
| Ballistic performance | ||||||||||||
| ||||||||||||
| Source(s): The big game express[1] & The Spanish Association of Cartridge Collectors[2] | ||||||||||||
Overview
editThe 20/577 Alexander Henry was developed and introduced by the Scottish gunmaker Alexander Henry around 1895 exclusively for his hunting rifles.[1][2][3][4][5]
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.[1][2][4][5]
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.[1][2][3][4][5]
See also
editReferences
edit- ^ a b c d Marrakai, "One of the harder ones: Alexander Henry's 20-bore/.577 Express", The big game express, No. 73, Eagle Park, Victoria: The Big Bore Rifle Club of Australia, July 2000.
- ^ a b c d The Spanish Association of Cartridge Collectors, "20/577 Alexander Henry", municion.org, retrieved 17 July 2018.
- ^ a b Cartridgecollector, "20/577 Black Powder Express", cartridgecollector.net, retrieved 17 July 2018.
- ^ a b c Cartridgecollector, "20/577 Alexander Henry Nitro for Black Powder", cartridgecollector.net, retrieved 17 July 2018.
- ^ a b c Czech Moravian Society of Collectors of Cartridges, "20/577 Alexander Henry", naboje.org, retrieved 17 July 2018.
External links
edit- Royal Armouries, "Centrefire rifle proof cartridge - .577 in Henry by Eley (1900)", collections.royalarmouries.org, retrieved 17 July 2018.
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