I've made 6.5 Creedmoor brass from a lot of different 308 brands. Pretty easy after the initial learning curve.
Get a Redding 6.5Creedmoor body die,would be my first suggestion.
I really like to tinker that's why I did it (made my own 300 BLK brass too) . My match brass is Lapua 6.5 Creedmoor now. I was using converted Lapua 308 Palma brass for the small primer, before they came out with their 6.5 CM brass.
One word of advice. Watch your neck thicknesses,you might need to turn the necks on some brands of brass.