I am not seeing a 200fps different with Hornady Superformance 165 SST.
30-06 is 1997fps and the 308 is 1902fps at 500 yards.
165 -168 grain is about the best BC you can get for this caliber. Since both the 308 and 30-06 are more than capable hunting rounds, I stretched their range out to 500yards to where there difference in velocities might make any difference.
At 500 yards the difference is
95ft per second.. Both calibers are capable of killing a elk at that range. Show me what range both of these calibers have to shoot for 95fps to make any killing difference?? The farther past 500yards you go the closer their velocities get.
I am not cherry picking my ballistics either. These both are the fastest velocities you can get with both calibers. 95fps is splitting hairs to say the least. Factor in modern hunting bullets and its a waisted comparison.
The killing power difference is so close and such a non factor it would be like dropping a 1/2 ton pickup 15 feet or 17 feet on top of you. Your extremely dead regardless.