I got about the same results with the 100gn TSX in my .25-06. I think I started out about .040-.050" off the land. Ended up .010" and bullets started grouping .5" or less. Extremely accurate closer to the lands in this rifle (Rem Sendero SF .25-06)..Hope this helps or maybe gives ya a nudge in the right direction. JohnnyK.
"The only thing necessay for the triumph of evil is for good men to do nothing."