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20/577 Alexander Henry | ||||||||||||
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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 | ||||||||||||
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Source(s): The big game express [1] & The Spanish Association of Cartridge Collectors [2] |
The 20/577 Alexander Henry, also known as 20/577 Express, is an obsolete rifle cartridge.
The 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]
The term express was first applied to hunting rifles and ammunition beginning in the mid-19th century, to indicate a rifle or ammunition capable of higher than typical velocities. The early express cartridges used a heavy charge of black powder to propel a lightweight, often hollow point bullet, at high velocities to maximize point blank range. Later the express cartridges were loaded with nitrocellulose-based gunpowder, leading to the Nitro Express cartridges, the first of which was the .450 Nitro Express.
The double rifle, also known as a double-barreled rifle, is a rifle with two barrels mounted parallel to each other. Synonymous with big game hunting found primarily in Africa and India, the double rifle is a purely sporting weapon with no military heritage.
The .577/450 Martini–Henry is a black powder, centrefire rifle cartridge, it was the standard British service cartridge from the early 1870s that went through two changes from the original brass foil wrapped case to the drawn brass of two parts, the case and the primer. The .577/450 Martini–Henry was introduced with the Martini–Henry, in service it succeeded the .577 Snider cartridge and was used by all arms of the British armed forces as well British colonial forces throughout the British Empire until it was itself succeeded by the .303 British cartridge after an unsuccessful trial of a .402 calibre
The .600 Nitro Express is a large bore Nitro Express rifle cartridge developed by W.J. Jeffery & Co for the purpose of hunting large game such as elephant.
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 hot climates in general and is a cartridge associated with the golden age of African safaris and Indian shikars.
The .475 No 2 Nitro Express is a British rifle cartridge developed by Eley Brothers in the early 20th century.
The .577/500 3+1⁄8-inch Nitro Express is a British centerfire fire rifle cartridge.
The .577/500 No 2 Black Powder Express, also known as the 12.7mm British No 2, is a British centerfire fire rifle cartridge.
The .400 Jeffery Nitro Express or .450/400 Nitro Express 3-inch is a medium bore, bottlenecked, Nitro Express cartridge designed by W.J. Jeffery & Co in 1902, intended for use in single shot and double rifles.
The .318 Westley Richards, also known as the .318 Rimless Nitro Express and the .318 Accelerated Express, is a proprietary medium bore centerfire rifle cartridge developed by Westley Richards.
The .400/350 Nitro Express, also known at the .400/350 Nitro Rigby, is a medium bore rifle cartridge developed by John Rigby & Company.
The .450 Black Powder Express also known as the .450 31⁄4-inch BPE was a popular black powder cartridge in the late 19th and early 20th century.
The .450/400 Black Powder Express cartridges were black powder rifle cartridges introduced in the United Kingdom in the 1880s.
The .255 Jeffery Rook, also known as the .255 Jeffery Rook Rifle, is an obsolete small bore firearm cartridge.
The .400 Purdey, also known as the .400 3-inch Straight and .400 Purdey Light Express 3-inch, is an obsolete rifle cartridge developed by James Purdey & Sons.
The .500/450 No 1 Black Powder Express, known in its day as the .500/450 No 1 Express, was a centerfire rifle cartridge developed by Westley Richards and introduced in the late 1870s.
The .461 No 1 Gibbs and the .461 No 2 Gibbs are two obsolete proprietary rifle cartridges developed in 19th century Britain.
The .297/230 Morris Short and .297/230 Morris Long are two obsolete centerfire firearm cartridges developed as sub-caliber training rounds for the British Martini–Henry rifle.
The .375/303 Westley Richards Accelerated Express, also known as the .375/303 Axite, is an obsolete medium bore rifle cartridge.
The .600/577 Rewa, also known as the .600/577 Rewa Nitro Express, Holland's .600/577 and the .577 Rewa, is an obsolete big bore rifle cartridge.