New to the boards and hunting, so I have a question I have not been able to find an answer to. I'm about to purchase a savage .308, but I'm not sure about ammo. I know that I can buy rounds for a .308, but I've heard I can also buy them for a .30-30 or .30-06 because they're all .30 cal rifle. Is this true? Also, if it is, why would a .308 be a .30 cal if it has the 8?