I have owned a dozen or more 22/250's over the years, 700s, 788's, and one howa. All of them shot best near the lands or just barely off the lands by .003.
Keep the copper out of the barrel, 22/250's are very sensitive to copper fouling.
If you can't touch the lands with pointy bullets, then go to the 55g Sierra Semi point bullet which is as accurate as Berger bullets. 63g Sierra will stabalize in a 14 twist, and IMR 4350 with win primers is your ticket. The semi point bullets will really put a smile on your face in how accurate they are and how they knock the day lights out a coyote.