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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.
However, the case has an added taper and is longer than 5.56x45 cases, so these cannot be reformed from any other existing case. The nominal bullet diameter is .357-inch, but SAAMI specs allow the bullet diameter variance to be .355-.357 357 Auto, Wildcat. Uses 10mm magnum pistol cases with a 6.8 SPC bolt-face.
The 6XC is a 1000-yard cartridge, comparable to benchrest calibers such as 6x47mm Swiss Match, 6.5×47mm Lapua and 6 mm/22-250; it fits into cartridge class that exceeds the velocities of benchrest calibers such as 6mm BR Remington, 6mm BRX and 6mm Dasher. David Tubb has claimed several wins with the 6XC in NRA High Power National Championships ...
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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 [ edit ]
The cartridge is a necked-up version of the .22 PPC which is in turn based on a .220 Russian (5.6×39mm). [5] The standard bullet diameter for 6 mm caliber cartridges is .243 inches (6.2 mm), the same diameter used in the .243 Winchester and 6mm Remington cartridges.
Therefore, the 243 Catbird is a 6mm-06 with a 35 degree shoulder and a 1.2mm longer case. [10] The .243 Catbird was developed by Jarrett Rifles to achieve 4000 fps with a 68-70 grain bullet. [ 10 ] [ 11 ] Actual performance tests showed the cartridge achieved 4100 fps with a 70 grain bullet, 3800 fps with an 85 grain bullet, and 3500 fps with a ...
Reduced barrel wear [5] compared to 6mm Norma BR; The 6.5×47mm Lapua has a base diameter and overall length similar to the 7.62×51mm NATO/.308 Winchester, allowing it to accept the same bolt heads and fit into similar short actions and magazines. A small rifle primer that is easier to seat and allows for higher case pressure than a large ...