This is exactly my thoughts. I was fortunate enough to harvest my first elk last year, and got the job done with my .270. I made the mistake of shooting 140 gr. sst's and didnt get pass through on any of the shots which got my wheels turning. I have since changed to 145 gr. ELD-X ammo and hope to get another opportunity. I bought a .300 WSM as my "elk gun" 3 years ago, but taking accuracy and shot placement the highest priority, it stays in the case as a backup.
Anyway it sounds like I have a sweet deer rifle for the kids in the future if nothing else.