I have a 24" 1:7.5" 6 Creedmoor. I actually got quite a bit better groups with the 101 vs the 88gr HHs.
H4350 @ 3220fps, into tiny little groups out to 400+. The 88s were above 3300, but at every charge weight, the 101s were more accurate in mine. Although, nothing over .65" 3-shots at 100 during testing.
What temp and elevation were you shooting them at 400+?