So, like I said in another thread, I know nothing about guns. So I decided to start reading about calibres on wikipedia. I'm not sure if wiki is wrong or written poorly or I'm just interpreting it wrong. The above article says they should not be considered interchangable, why? The .308 Win was made to be the civilian version of the 7.62, right? The article on the .308 Win even says: So what are the differences?