308 won't give you the drop dead power the 30-06 and 300 win mag will. If you want to be able to shoot 400+ and have knock down power you will want to move up to something a lot better than the 308 the ballistics for the heavier bullet weight aren't what you need. But if you want to tap steel at 600 then 308 is good. But if your gonna do it do it right and go big.