My buddy's that reload tell me you can make a 7-08 out preform a 308 in you know the right data.
Define outperform...
Yeah I'd like to talk to his buddy's about that statement
X3, I'd like to listen in on that .
This is absolutely a true statement, and you don't even need any mysterious "right data" even factory ammo will quickly prove that the 7mm-8 is ballistically superior to the 308. If you take similar-weight bullets from each cartridge, the 7-08 will drop less, drift less and will retain more energy and velocity than the 308.
as I said earlier though, for deer hunting in the south you will never notice the difference. both are fine cartridges.