RE: is it enough?
The .300 WSM has no where near the ballistics of a .300 Wby and is still a little ways behind a .300 Winny. It does, however, put the .308 Win and the .30-06 in the back seat, and it does not kick as much as the other mags.
The .308 Win is a fine round and is certainly adequate for elk out to 250 yards or so with proper bullets. If you want a little more punch and want to keep the short action, check out the .300 WSM.
Good Dogwork and Good Hunting