6 mm B.R. Norma

The 6mm BR Norma is a centerfire rifle cartridge designed for target shooting and varmint hunting. It was introduced by Swedish manufacturer Norma in 1996, and is based on a necked-down version of the 7x57mm Mauser case.

The cartridge has a bullet diameter of .243 inches (6.17mm) and a case length of 1.57 inches (39.88mm). It is known for its high accuracy, low recoil, and flat trajectory, and is capable of producing consistent, sub-MOA (minute of angle) groups at ranges up to 600 yards.

The 6mm BR Norma is commonly used for benchrest and F-class competition shooting, where precision and accuracy are the top priorities. It is also used for varmint hunting, thanks to its flat trajectory and high velocity, which make it capable of delivering accurate shots at longer ranges.

The cartridge is typically loaded with bullets weighing between 70 and 105 grains, with the most popular bullet weights being in the 80 to 90 grain range. These lightweight bullets allow for higher velocities, which translates into flatter trajectories and less wind drift.