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The Barrett Model 99 & .416 Barrett
The .416 Barrett or 10.6x83mm 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-caliber 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 10.6x83mm.
The Barrett .416 cartridge was designed by Pete Forras, who recently retired from Barrett. The bullet was designed using 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 3.27 inches (83.06 mm) and necked down to accept a .416 caliber, 400-grain (26 g) projectile; It is however of proprietary dimension. 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. Recently the Bohica Arms FAR-50 MK-II bolt-action, single-shot AR-15 upper receiver conversion became also available in .416 Barrett. Noreen rifles makes a rifle in .416 Barrett and other large calibers. Barrett now also chambers its semi-automatic M82A1 in .416 Barrett.
The use of a lighter, narrower bullet results in a significantly higher muzzle velocity and superior ballistic performance to the .50 BMG, and the .416 Barrett is claimed to retain more energy than the .50 BMG at distances over 1,000 yards . Barrett claims that this cartridge is capable of propelling a 400 gr solid brass boattail spitzer bullet out of the 32-inch (810 mm) barrel of a Model 99 single-shot rifle at 990 m/s (3250 ft/s), giving it a ballistic coefficient between .943–.989 and keeping the projectile supersonic out to 2286 metres (2500 yards).
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