Just a sample of one, but believe that you're making a generalization about the 'eastern thinking' as I live in PA and in the event that I make it out west to hunt elk, it would be with a 270....
Yep. Generalization is not a good thing. The 'magnum craze' was not an Eastern thing. I remember reading Boddington in the 80s and 90s, and how the 338WM, 8mmRM, etc. were so much better for elk and the 375 H&H minimal for the "big bears". Can't count how many times where a gun writer opined the 270Win as "marginal" for elk.
Wasn't true then, and definitely not true now with modern bullets.