For elk, .325 WSM in a Kimber or Ti Browning.
I've got a Kimber Montana .308. I'd hunt elk with it but I wouldn't have selected it if the main job had been elk. My gun isn't very accurate when loaded near max. If I load it for accuracy, I basically have a light weight .300 Savage. Makes deer inside 250 yards very very dead but I'd like a little more "snot" for elk or if the range begins to stretch for deer.
Tom