Some useful info here maybe?
https://dallasreloads.com/product/6-creedmoor-subsonic/
talks about using Sierra 85gr SP for 1:10 twist
FYI, I have tried 90gr XTP in 308, was subsonic with 4.5gr of AS50n. For comparison, 165gr bullet in 308 was subsonic with 6.0gr of AS50n...
Bookmarks