Haven't tried any 139 but some Moly 144 loads with N160 powder. Best what I'm found so far is 0.75 MOA (1.7") to 200 meters in my Tikka Hunter Deluxe. The load was not very hot but above Vihtavuori reloading manual maximum load.
The lands are so far in CIP standard 6.5x55SE chamber. What cartridge overall length are you using in Sako and Tikka factory rifles?
Heikki in FIN