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.416 Barrett
The .416 Barrett or 10.6×83mm centerfire rifle cartridge is a proprietary bottlenecked centrefire rifle cartridge designed in 2005. It is an alternative to the .50 BMG in long-range high-power rifles. It was designed in response to a request for a medium/heavy rifle/cartridge combination that was issued from Naval Surface Warfare Center Crane Division in late 2004. Its metric size is 10.6×83mm.
==Design==
The Barrett .416 cartridge was designed by Chris Barrett,〔(Shooting Times )〕 son of Ronnie Barrett, with the help of Pete Forras. The bullet was designed using some NACA low-supersonic-drag equations to design the shape.
The cartridge was designed as an improvement to the .50 BMG cartridge, a common machine-gun and rifle cartridge. It is similar to a wildcatted .50 BMG case, shortened to and necked down to accept a .416 caliber, projectile;〔(cartridge picture )〕〔(Barrett FAQ )〕 it is however of proprietary dimension.〔"(Barrett FAQ )"〕 Because the two cartridges, the .50 BMG and .416 Barrett, have identical base dimensions, all that is needed to convert a rifle to use one or the other cartridge is a relatively quick barrel swap.
For some time, the only commercially-available rifle in this chambering was the single-shot Barrett Model 99. In August 2009, Zel Custom Manufacturing released the Tactilite .416 Barrett upper for AR-style rifles.〔(Zel Custom Mfg. website )〕 Recently the Bohica Arms FAR-50 MK-II bolt-action, single-shot AR-15 upper receiver conversion became also available in .416 Barrett.〔(Bohica Arms FAR-50 MK-II )〕〔(Bohica Arms website )〕 Noreen rifles makes a rifle in .416 Barrett and other large calibers. Barrett now also chambers its semi-automatic M82A1 in .416 Barrett. Desert Tactical Arms offers a bullpup rifle in .416 Barrett.〔(DTA HTI Rifle Chassis - Desert Tech )〕
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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