I have a Tikka T3x and the throat is quite long and the magazine is M+ so you can seat the bullets well out. This drops the pressure so with my particular Tikka I can load in more powder and get quite decent velocities. Also, 6.5 Tikka barrels have a reputation for being on the slow side.
My normal hunting load which is around .50 MOA is 44.6 grs 2209 with the 143gr ELD-X in Lapua brass, CCI 450 primer (well over book max) but perfectly safe and certainly not hot in my particular rifle. This chronographs at 2,780 fps. in my 24" barrel. Can get a lot higher velocities with moderate pressure using RE 16 and particularly RE 26. However, there is not much point in doing so.
I also use this rifle for competition hunter class events and use the 140 ELD-M in Peterson brass at around 2,620 fps for under .50 MOA and reduced recoil and barrel erosion, particularly so with the sustained fire rate of five shots in five minutes.
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