I would say "yes" and "yes" - by a very small margin. If both guns have comparable barrels and are loaded with 150 grain bullets, the .270 WSM is a little faster and the bullet has a little better sectional density. If you shoot 140's or 130's, the WSM is even faster at about the same sectional density. It also seems to have alittle less recoil to boot - although this is subjective on my part, and not based on any sort of quantitative comparison. Accuracy with either can be very good -but the short fat case w/o a belt would give the WSM the nod in that regards as well - at least on paper. In the field, however, you probably wouldn't notice any difference.