RE: Still trying to decide...
Before buying a WSM or worse a WSSM try racking a few through the chamber quickly. My buddy has a 270 WSM ABolt and at least 5 of 10 times through they jam or don't feed right. A good old 270 with Hornady Light Mags will do all that a short mag will. I f you reload you will have issues seating longer(heavier) bullets because of lack of headspace. I sound like an old codger but they seem just to be the sexxy choice. Check the ballistics out on 140 gr light mags on Horady's website.
Good luck