Ah what the heck, even though I'm way behind in knowledge and experience, and it seems this has been beat to death, hear's my opinion
Specs for mil are:
1) fill the gap between 50 and .308
2) light weight
3) battlefield durability and dependability
4) barrel life
5) standard round
I think the obvious choise is the 338 Lapua or the 300 win mag because they fit the criteria and they have been used in the past by the military.
I love the WSM and other steep shoulder cases, but the truth is that they could pose problems when chambering in adverse conditions.
I love the Idea of having a super fast bullet, but the snipers need to be able to fire thousands of rounds on a barrel.
Howzat for beating a dead horse