The 6mm Creed won't be fussy, they tend to shoot everything well. H4350 is popular, also H4831sc, RL16, RL26, IMR 4831, N560...
As for bullets, I tend to shoot heavier for caliber bullets that jive nicely with the 7.7 twist. I shot a few coyotes with the 105gr Amax and it worked well, made a big hole but killed good. Now that I am out of those, I am going to work up a load for the Sierra 100gr Tipped Gameking. Should be a good dual purpose deer / predator bullet. I'll probably start with RL26 as I have a lot of it on hand
Great cartridge!