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The 6mm BR / 6.2x39mm is a centerfire cartridge created for benchrest shooting. The cartridge is also known as the 6mm Bench Rest or simply 6 BR, and has also developed a following among varmint hunters because of its efficiency. [5] There are two basic variants of very similar dimensions, known as the 6mm BR Remington and the 6mm Norma BR.
For an ordinary AR-15 rifle chambered for the .223 Rem/5.56mm NATO, a new barrel, magazine and bolt are required to convert to the 6mm ARC. [7] The 6mm ARC utilizes the same bolt head size as the 6.5mm Grendel, and 6.5mm Grendel-compatible AR-pattern box magazines have also been used successfully with the 6mm ARC. [8]
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Any AR-15/AR-10 cartridge cases that are derived from the 7.62x51 can also be formed from these listed calibers. (7.62x51 & .308 are similar in external dimensions though the Brass has different internal capacity and Max PSI recommendations are different & Chambers are different.) AR-10: The AR-10 is slightly larger and heavier than the AR-15.
The 6mm AR / 6x38mm AR is an intermediate centerfire wildcat cartridge initially designed by Robert Whitley [1] for long-range performance in an AR-15 rifle. Description
6mm AR; 6mm ARC; 6mm BR Remington; 6mm Creedmoor; 6mm Lee Navy; 6mm Musgrave; 6mm PPC; 6mm Remington; 6mm TCU; 6mm XC; 6.5-06; 6.5-06 A-Square; 6.5 Precision Rifle Cartridge; 6.5mm Creedmoor; 6.5mm Grendel; 6.5-284 Norma; 6.5mm Remington Magnum; 6.5mm TCU; 6.5 Weatherby RPM; 6.5×47mm Lapua; 6.5×50mm Arisaka; 6.5×52mm Carcano; 6.5×53mmR; 6.5 ...
The 6mm BR to the left and 6mm Dasher in the middle are common benchrest cartridges, here compared to a .308 Winchester cartridge to the right. Only the most consistent and efficient cartridges can provide the necessary accuracy for benchrest shooting. Initially, many chamberings were tried, with the .219 Donaldson Wasp probably being the most ...
The Model 7615P comes in .223 Remington caliber, uses standard M16/AR-15 style STANAG magazines and has a 16½" barrel. Just like the Model 7600P, the Model 7615P is designed to be a low-profile, user-friendly firearm for police officers to use alongside the Remington Model 870 shotgun.