I tried 50.0 RL26 with a 130 accubond in Lapua brass in my tikka Swede. 5 shot avg 2770 fps. Tula LRM primers. I could probably add a couple grains. Barrel gets real hot very quickly with RL26.
Barrel only has 25 shots through it, do Tikka barrels speed up after 150-200 shots like a Bartlein does?