7mm/08, 6.5mm/08, or 7.62 X 51, to me, are almost identical Of course they are all from the T65E3 Nato cartridge. All three are suitable for the same size game, and I doubt much if any difference exists between terminal effect when hunting deer.
I still think the .308 is a better long range round, but for normal hunting ranges, just buy the one that strikes your fancy, and don
't worry about the others.