I don't have a 6.5 creedmoor, I have a .260 Rem so take that for what it's worth.
I blew through quite a few 140gr Berger VLDs at different powder charges, seating depths, etc (other than tight jam...just not interested, I like to be able to unchamber a round etc) and I just couldn't get them to shoot.
Had some 142 SMKs so I tried them and I haven't finished fine tuning it but so far 42.5 or so grains of H4350 is showing promise and velocities of 2850ft/sec.
Again, this is for .260 REM but that info may still be useful to you for comparison.