Unless you are going to be shooting over 400 and 500 yards, then you are better off just using the 270WSM. You can rebarrel to a 6.5WSM, but you will have to neck down the brass, and probably do some neck turning depending on the reamer used in the rebarrel. There is not a lot of ballistic difference in the 270WSM and 6.5WSM with 140 gr bullets until you start getting out past 500 yards or more.