I can see no reason that the 270 and 300 WSM would ever fall by the way side. There have been thousands already sold and in my area they are out selling all other cartridges. They deliver the same
me performance in a much shorter action. For me personally, the 308 is all I would ever need. I mean the 308 and the other cartridges based on its casing. The 338 Federal would be the perfect bigger rifle for me. That would just be for Moose and the big bears even though the 308 would probabbly also do it all.