Your point of a 300WM having165yds more of range than a 30-06 based on velocity is valid. However, effective area would only come into play if you are shooting a Gatlin gun while spinning on a merry-go-round. I don't typically bring a merry-go-round along with me in the back country.
I think his point is that there is 85% more area where a single elk might appear that you would have a good shot. One shot.
