I am not sure what your really gaining in the 270WSM? If you want smaller, lighter and short throw...then fine. I don' t really believe the published data put out on the WSM or the likes and even if possible, not with factory ammo and real hunting conditions. So I would lean right now toward the standards, for the same reason as bear72 brought up, ammo selection and price.

The 300WSM I would consider, but not the 270 or 7..at this point.