RE: .308 or 30-006 for deer???
You are 100% correct the .308 is the most common sniper round. Almost every sniper rifle set up I have seen is .308 including the team I'm on.
I love my .308 for people, but for whitetail I have to agree that the 30-06 is a better choice.
You have many more types of bullets to choose from and more energy.