This is hard to predict beyond the influence of prejudices, relatively limited experiences, and influences such as loading skills/knowledge, the quality of scopes used on each brand, distances fired, etc...
Now that I’ve qualified my answer I can tell you what my limited experiences and observations have shown me.
I have a Criterion 6mmBr from Northland Shooter Supply that I shoot primarily at 300. It’s a 700 in an old, a pillar bedded 40-X stock. Its Jewell trigger is set around 4 oz. I’ve tried mostly Re-15, Varget, and H-4895 among others. Sierra 107s and 95s (both SMK and TMK), Berger Hunting VLDs and Hybrid 105s are 99% of the bullets I’ve used. I’ve shot seating ladders and OCW targets ad nausem (about 600 rounds so far). My BEST 5 shot, 300 yard groups run around 1.75” with 2” more common.
I’ve got a buddy who bought a BugNuts Bartlein in 300 WM about the same time. He’s bedded in a factory glass stock with about 4 lbs of added weight. He’s tried 2-3 powders and 2-3 bullets. His best 5 shot 800 yard groups run just a smidge over 5”. He uses a bipod while I use a Bald Eagle rest.
He’s got about $230-ish more in his barrel than I do in mine. We don’t compete formally, just a group shooting for bragging rights.
Conclusion based on the limited data: He shoots his rifle more accurately than I do mine at the distances involved. Could be the arrow, or it could be the Indian.
I believe when I barrel again I’ll go with cut rifled barrel....that is if I don’t try a X-Caliber pre-fit first. They’re on sale by the way.
Let us know what you decide to do.