After WWII SAKO made civilized Mosins with 600 mm barrel. Those rifles caliber were 6,3x53R, 7x53R, 8,2x53R and finally 9,3x53R. NOT 7,62x53R which was allowed military purposes only. Those rifles used to have special rear sight with drum calibration. Nowadays this kind of sight is very uncommon, I have seen it only twice.