As I have neither the 6.5 CM nor the .260 I will relate a story my neighbor told me about his 6.5 CM.
He bought the rifle and took a class in long range shooting. At the end of the day he was banging steel at 1000 yards with factory ammo.
He didn't say what brand but he did say he didn't thing he would reload as the factory stuff and his rifle were already so accurate.
Even with that story I haven't bought one (yet).
As others have said the 6.5 CM does what it is advertised to do.