Well I have been watching this one and finally just have to put my thoughts in. Yes I do believe there is a ton of hype around the 6.5CM, and it can kill elk, has killed lots of them. But is it really the be all / end all to our needs? Is it really a viable elk round? Under ideal circumstances, yes. But what about when circumstances are not ideal? Then the answer is no. A broadside shot at 100 yards? 300 yards...yes. A quartering to shot at any range...no. So I think the true responsibility falls on the shooter.
I have on two instances seen hunters show up in Texas after Nilgai with the 6.5CM. They were flat out told to leave the gun and use the guides gun. For one of those hunters, the Nilgai dance was 4 shots with a 300 Win Mag before the beast was down. Nilgai are tough beyond belief, but honestly can give away 200 - 300 lbs to a bull elk.
I always go back to some sage advise given to me long ago by a very wise and successful hunter who has long since passed from this world. Match your caliber and range to the game intended, so that you can make a vital shot from any angle...because you never know when some unforeseen variable will materialize on your first shot, and you may need to make a second shot under the worst possible circumstances. Been there, done that.
That said, I shoot a 340 Wby for nearly all my hunting, and it has never let me down. My wife shoots a 300 WSM for her caliber of choice. Yes, recoil was an issue for both of us, but just like putting the pads on the first week of football practice in high school, when everything just seems to hurt. Practice will allow you to overcome the recoil, if you can't, step down in caliber.
Now before I'm chastised for my choice of magnums. I also feel that using a 30-06, with 180's at 2700 to be perfectly acceptable for elk, just mind your range and choice of bullet. Same goes for a 340, a 300 and a bazooka.
Just my .02