The price per round component throws a wrench in things , but anything that produces 1k ftlb of energy at 1k yrds will fit the bill. Big 7mm , 30's , or the dedicated 338's do it well. The 6.5 SAUM does it too.
So I guess the 300WM really shines when the cost per round aspect is considered. I think the cost per round should be considered in relation to barrel life as well , and here the 6.5 SAUM really shines.

(you can build a 6.5 SAUM on a long action)