I'll also say that with regard to military rounds, the .308 was a mistake. It's whole reason for being was commonality between machine gun rounds and rifle rounds with the understanding that riflemen needed a shorter round so they could carry more ammo. Well, the .308 is a little shorter but not much lighter and regardless, it was only the rifleman's round for less than a decade.
What we should have today are 5.56 rifles and 30-06 machine guns and sniper rifles with today's powder it would be a significant upgrade in performance.
