Several 6.5mm 139-142 grain LR match bullets have BCs around .600 or a bit better. That is impressive, since it takes a much, much heavier .308 bullet to even get close. In the 308 case, there is insufficient capacity to push those heavier bullets at enough velocity to make them a good 1000 yard performer. The 6.5x55 is hard to beat. Regards, Eagleye.