JC How have premium bullets let you down?
Between the 2 not a hill of beans for whitetail and 300 yards of difference. No wrong answer. Then again the ones you already have are dually capable as well. I maybe one of the few but I don't believe a safe needs a .308cal. I do have a mod94 3030 that is a pass down but my hunting safe is void of any 30 cals and see no change to that strange happening. If i ever did I'd go back to being an owner of a 300wm. Figure my .22, 25, .277, .284 and .338 have it covered for NA.
FYI, the 308 isn't a flatter shooter then 06'
Any how it comes down to which one you want.
Good Luck