I had the same high sds with staball and lapua srp brass with berger 105s. I would be fine with the sds with hornady pills, but not those berger gold nuggets.
Not a 300 prc, but my son has no problem shooting .5 moa with his proof 6 creed barrel with hornady factory ammo. I do know that atips like quite a bit of jump, but you said you tried factory as well and that was a no go. If you are completely sure your fundamentals are on point, you should be...
With brass, powder, and primers so hard to get at the moment, I just went with what I could acquire, which was lapua srp brass and cci br4s. I don't try to push my loads, but I have had no primer cratering at all.