The Swedish-Norwegian Rifle Commission started its work in 1891. One of their first tasks was to find the best possible calibre for the new weapon. After extensive ballistic tests where different calibres were tested (8 mm, 7.5 mm, 7 mm, 6.5 mm etc.), the optimal caliber was determined to be 6.5 mm (0.256 in). Following this decision, a joint Norwegian-Swedish commission was established in December 1893. This commission worked through a series of meetings to decide on the different measurements for the cartridge case. A rimless cartridge case of 55 mm length was approved, and each possible measurement (diameter at base, diameter at neck, angle of case, angle of shoulder etc.) was decided upon. The corresponding dimensions of the cartridge chamber to be used in a future service rifle was also determined. The cartridge became what is later known as 6.5×55mm. The round of ammunition is also known as 6.5×55 Krag, 6.5×55 Scan, 6.5×55 Mauser, 6.5×55 Swedish, and 6.5×55 Nor, but they all referred to the same cartridge.