6mmAR
Encyclopedia
The 6mmAR is a centerfire
Centerfire ammunition
A centerfire cartridge is a cartridge with a primer located in the center of the cartridge case head. Unlike rimfire cartridges, the primer is a separate and replaceable component....

 wildcat cartridge
Wildcat cartridge
A wildcat cartridge, or wildcat, is a custom cartridge for which ammunition and firearms are not mass produced. These cartridges are often created in order to optimize a certain performance characteristic of an existing commercial cartridge.Developing and using wildcat cartridges does not...

 designed by Robert Whitley for long-range performance in an AR-15
AR-15
The AR-15 is a lightweight, 5.56 mm, air-cooled, gas-operated, magazine-fed semi-automatic rifle, with a rotating-lock bolt, actuated by direct impingement gas operation. It is manufactured with the extensive use of aluminum alloys and synthetic materials....

 rifle
Rifle
A rifle is a firearm designed to be fired from the shoulder, with a barrel that has a helical groove or pattern of grooves cut into the barrel walls. The raised areas of the rifling are called "lands," which make contact with the projectile , imparting spin around an axis corresponding to the...

. The cartridge uses a 6.5 Grendel
6.5 Grendel
The 6.5 Grendel is a proprietary intermediate cartridge developed in 2002 by Arne Brennan . This cartridge is an improved version of the PPC cartridge family designed by Dr. Lou Palmisano and Ferris Pindell in 1974. The first 6.5mm member of the PPC cartridge family was created in 1984 by Dr...

 case that has been necked-down to accept a 6 mm (.243 in.) bullet.
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