i used to own a 14", 16 1/4" and a 23" MGM encore barrels in 6.5 creedmoor. this was before all that hype, i had to use 22-250 brass to make 6.5 CM brass cuz no one had it. i shot it at deer and targets and i was the only one that had it. a few years go by, everybody chambers for it, so i sold them. i like different or old cartridges.
i have a 6.5x55 swede(Numrich barrel) built on a 1916 spanish mauser with a richard's gunstock(which i have to do, my youngest son's gun). a husqvarna m46 in 9.3x57, which happens to be one of my favorites. the other favorite is a 35/30-30 in win m94(JES Reboring).
it seems to me, that the new cartridges are just rehashes of the old ones.