The only reason to use see-thru mounts is if you plan on taking shots at running game fairly close to you in the brush. The .270 shoots flat enough that you don't need to use iron sights for one range, and a scope for longer ranges. The scope will allow you to see better in low light than those iron sights will. Plus, for most people (except Mark ) they cause you to raise your head, lifting your cheek from the stock, in order to see thru the scope. Bad idea for best accuracy. You should have firm cheek to stock contact for best results.