Oregonian here.
I got told when I brought my 270, 'thats the minimum for elk' what ever.
I normally hunt with the old faithful 06 but wanted to get blood on the 270 and never felt under gunned.
Its weird that the guys in camp now, all want 300 RUMs.
I told my buddy if you really want an elk thumper get 338 if you already have an 06 that you just killed a 350 +/- bull last year. I don't know. To each his own I guess.

All of them do something better than the 30-06, but none of them do everything as well.