I've read Tikka barrels are slower, and that is likely just the case here. I average just a touch over 2900 with 41 grains of Varget, without really seeing signs of pressure, then again I'm fairly new to reloading so I'm not going to push it any higher.
In my initial testing of charges, my gun had a nice flat spot right at 39.6 with an average of 2,840 FPS. I'm going to load some rounds up for groups at that charge and see what I get.
I went out today and had 4 different seating depths tested at 40.7 gr, all were sub MOA at 200, but some opened up a bit at 300. I feel like I could achieve better. I'm enjoying the process.
Try some H4350 if you can find it. I have a great load with the hammer hunter 124, 45 gr H4350, federal 210m primer and lapua brass. 3003 fps with a 3 shot group at .3" @ 100 yd. This is out of a Tikka T3x.