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.450 Rigby
The .450 Rigby Magnum Rimless, better known simply as the .450 Rigby, is a .45 caliber (11.6 mm) rimless, bottlenecked cartridge intended for the hunting of heavy dangerous game. The cartridge is based on the .416 Rigby necked up to accept a bullet. The cartridge is intended for use in magazine rifles. The cartridge should not be confused with the .450 Rigby Nitro Express, which is a rimmed cartridge that is intended for double rifles.
==History==
In 1993 Paul Roberts (at the time proprietor of John Rigby & Company) was on an elephant hunt in the Zambezi Valley. Both he and his professional hunter, Joseph Wright, were armed with .416 Rigby rifles for the occasion. An elephant was found and then shot in the lungs, but due to a misjudgment in distance several more rounds were required to finally bring down the elephant.
After this experience, Paul Roberts felt that a cartridge with a greater bullet weight of a larger caliber would have been more effective in that situation. Once Paul Roberts returned to the United Kingdom he necked up the .416 Rigby case to .458 caliber. The new cartridge fired the of the .450 Nitro Express cartridge at a velocity of from a barrel. The new cartridge was named the .450 Rigby Magnum Rimless in 1994.〔 The cartridge was put into production in 1995. The John Rigby & Company was building the .416 Rigby rifles on the 98 Magnum Mauser action. Since the .416 Rigby and the .450 Rigby use basically the same case, building rifles for the .450 Rigby was rather simple requiring only a chamber with a modification made in the collar area and a .458 caliber (11.43 mm) barrel.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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