Depends on to many factors... What are you calling long range ? 1000 yards to me is LR, 1500 + is ELR
What is the ASL where you will be using it ?

I shoot the 178 A-Max in my .308's to about 1100 and they do well. I have a box of 208's to play with, but as of yet I have not, so I can't give you any real data.

30/06 will give you more FPS, and of course FPS is big in the LR game, so I would lean that direction with the heavies for sure.... Figure out the Max OAL your mag will handle and have the barrel throated accordingly. I will say tho that I feed 3.890 .338 EDGE in a stagger feed mag I modded, so I would not expect any serious roadblocks in a /06 lol.