I own two 6.5 Grendel, and one .308 WC barrel.
They all shoot sub-minute with handloads, not occasionally, but regularly for five shot groups.
None of them will amaze you if you look at it with a borescope (but that doesn't matter if it shoots).
If I wanted another $300 barrel for general hunting, I'd have no problem going back to WC. If I wanted a barrel more for target work...well, I went with Proof for my last 6.5CM build.