Jon S,
Look up scenarshooter,
He posts some pretty convincing photos of long-range whacking with his 308.
Look through this thread at all of the kills Pat (ScenarShooter) has made with his 308 & 155 Scenars. Notice the distances listed particularly. Pictures start on page 3, but, I'd read the whole thread.
http://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/9735118/1