With new machining and everything, it doesn't matter if its semi auto or the bolt action. Bolt actions are more elegant and have a legacy over semi auto.
I own PTRs, G3, and M1. LeEnfield M4 chambered 308 is my favorite. I would suggest buy a new PTR91. Nothing beats this in the market than this neat thing. http://ptr91.com/
Buy LC or Seneca Armory ammo and off you o to an enjoyable 308 experience.