Ok so it sounds like the answer is yes with some caveats. Reason is I'm in CA and we are now lead feee (freaking communist here) and plan on a lot more out of state hunting. I'm building a new 308 and thinking that if I can get a 140-150 grain bullet in a solid that is pushing around 2000 FPS Out around 400 yards that would be about equal to my 300WM throwing 180 grain lead bullets out to similar distances... but that is my question.
I don't really see myself going much further then 400 yards with a 308. If I was going longer I would probably take the 300WM with copper bullets in the 165'ish grain.
basically looking for a mule deer and backup elk cartridge. My 300WM is a heavy rifle and not sure I want to carry it 10 miles a day and if I can get similar performance out of a 308 I would be happy to stock an animal for a sub 400 yard shot.