I have been shooting the 6.5 Creedmoor since 2011.You may want to ask Kilotanker.
He's been rocking the Manbun for a couple of years now.
He's been playing with different powders & bullets.
I've been hearing the 6.5 Staball shoots decent, but kinda dirty.
It's really making roads into the 7mm-08 though. Really good velocities with that cartridge.
The new Alliant TS15.5 is showing promise in the Creedmoor line of cartridges.
Not much load data on it as yet though.