About the same time of the OP I went to a gun store to ask this very question to the expert behind the counter.
He grabbed a 308, said it was the most "inherently" accurate round ever made. For affect he slapped the bolt and sniffed with authority.
I asked, well if a 270 was flatter shooting wouldn't that make things easier?
He responded no, a 308 arcs- but it arcs to the target.
So there ya go.
