The .270 and the 30-06 are close to the same gun other than bullet choice (180 vs 150) in the two.Both shoot flat enough to not be much of a difrence.

If you are looking for a little more horse power move up to the magnums 7mm RM,7mm WBM,300 Win,300WSM.
Or go bigger yet to the 7mmSTW,7mm Ultra,300 RUM,300 WBM.

These all offer more speed and knock down power one would want,they do kick harder,it all comes with a price.