I second redhawk's remarks. If you REALLY want a semiauto that'll shoot any factory load good,get a BARwith BOSS and CR (conventional recoil)module for it.The cr piece DON'T make it louder like the regular boss does. I realize a lot of people condemn the boss but I have seen the results in side by side comparisons and the boss flat out works. Also I would go with the 7mm rem mag or 300 wsm over the 270 wsm as you already have a 270.