Have you done the 6.5 guys load development method? I used tried this with my 22-250 and I got favorable results.
140gr bullet and 41.5gr H4350 @ 2.81” COAL is the 6.5 Creedmoor easy button...mild load that shoots decent to good in most rifles.
I prefer OCW and generally find a higher node in the 42.3-42.7gr ballpark.