If you are trying to make a choice between the 06 and the .270, you should go to Winchesters web site and check out their ballestics compareson. The .270 carries it's knetic energy to a much greater distance. That's comparing a 130grn .270 to a 180grn 06.

at 500yds the .30-06 180grn drops from 2913ft lbs to 625
at the same distance the 130grn WSM drops from 2702 to 1243