Except even factory ammo tends to be slower from a Tikka than other rifles of same barrel length. This has been pretty well documented by shooting over chrony. Googling "Tikka slow barrels" brings up a lot of interesting reading on it.
Maybe it isn't always the case...but it does seem pretty regular.
I have owned four Tikka rifles, and I have loaded for several more, and in each case, they produced similar velocities to other brands with the same barrel length. I develop a load for each rifle, so in some cases the Tikka load may have been a grain more ro achieve the same pressure/velocity, but the potential was still similar.