Put a 24" barrel on a 308 and 22" barrel on a 30-06 and watch two ballistic 'sisters' look like twins. And then if you want to hand load you can easily have the 308 past factory 30-06.

Having said that and having given the whole 308/30-06 alot of thought and time reading charts I still laugh when people say the 308 can't do something a 30-06 can. Unless you load the 200+ bullets your barrel could make up the little difference.