A few points:
1. Correct me if I'm wrong, but isn't the PSS built on a short action, and the Sendero on a long action? Will this make much difference? Not sure.
2. What kind of hunting are you thinking of doing? Out to 600 yd, or 1000 yd? You will need a different gun for 1000 yd--much heavier barrel, and thus much more of an issue if you are going to be lugging it up and down mountains. For 1K you may need to think of moving up your caliber to a 300 WinMag or equivalent.
3. Another option: If you are set on a .308 (excellent choice for out to about 800 yd depending on your target), then consider the Model 700 SS 5R Milspec. This comes with the same barrel specs as the M24 sniper rifle--24" barrel, 5R land/groove profile. From what I've read (don't have any 1st-hand experience unfortunately), this is a 1/2 to 1/4 MOA gun out of the box. Sometime can be hard to find. Look online.