I'm heavily invested in several 308 rifles and have a 30-06 with too much history to sell although I rarely use it anymore. I like my 308's; have some nice rifles and have put in the time to work up loads for them that work well.
I bought a 6.5 CM just to see what the fuss is all about. I'm impressed with the cartridge, but at this stage of my life probably won't change. The 6.5 will remain a range toy for me and I'll probably hunt with the 308's the rest of my hunting career. The 308 MIGHT be a slightly more effective cartridge on game bigger than deer, but if a 6.5 isn't big enough to get the job done I'll skip right over 308, and even 30-06 for that matter.
The thing that opened my eyes was a ballistics gel test I saw comparing a 143 gr Hornady ELDX in 6.5 CM to a 178 gr Hornady ELDX fired from a 308. Both bullets penetrated exactly the same distance and it was impossible to tell the difference in expanded bullet diameter just by looking at it.
