![]() The 6 BRA has nearly identical dimensions with a 40° fire-formed neck. The two most popular 6BR-based cartridges I've seen in the space are the 6 BRA (6mm BR Ackley Improved) and the 6mm Dasher. 6MM NORMA BR, 6BR ACKLEY IMPROVED, AND 6MM DASHER You might be asking, "with these results, why mess with the cartridge?" and that's a fair question. You get these results with about 10 grains of powder less than a 6 Creedmoor. I've had 5 shot strings with a standard deviation of 0.5 fps and an extreme spread of 1 fps. The 6mm BR Norma is capable of some extreme accuracy. Out of my 6BR rifle, a Tikka T3 re-barreled with a heavy Bartlein 1:8" sitting in an MDT ESS Chassis, the load development took one Optimal Charge Weight test to find the winning load. ![]() In my experience with the 6BR, it's insanely easy to load for. The 6BR and its variants are inherently accurate. Typical velocities with a 105-grain bullet are around 2850 fps. The case is a relatively short 2.200" with a 1.075" body, 30° shoulder, and 0.640" neck. More: Building a 308 Tikka Rifle 6MM BR NORMA SPECIFICATIONS AND HIGHLIGHTS Side note: This rifle may look familiar if you read my article on building a 308 Tikka rifle in May. This article will discuss the 6mm Norma BR, also known as 6mm BR Norma, and its use in PRS style competition. In 1996 Norma, a Swedish company, introduced the 6mm BR Norma. Over the next 40 years, the cartridge was tweaked for various disciplines. 308 Winchester as a wildcat, it would become commercially available in the late 1970s. The 6mm BR (Bench Rest) was created in the early 1960s for, you guessed it, bench rest competitions. Sometimes there are legitimate improvements sometimes, it feels like they reinvent the wheel. ![]() Every year, there is some new cartridge that is supposed to improve on previous favorites. In the world of precision shooting, cartridge options are constantly evolving. ![]()
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