I have always wondered about the hunting accuracy barrel life and I think there is less information on this because most rifles used for hunting are not shot out. The 6.5 Gap or 6.5 SAUM when used for target shooting can get a little longer barrel life by using the larger capacity case to push the bullets at 6.5x284 velocities at a lower pressure and not trying for the next faster accuracy node. My guess is the 6.5x284 would be similar to the 25-06 for barrel life getting slightly less possibly due to the longer neck on the 25-06. But then the shoulder angle on the 06 could undo this advantage.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli