Herman -The tikka t-3 does come chambered in 25-06.
bbureau1-I live in alberta and hunt in conditions from -30 to +90 from rain to snow and I only use stainless synthetic stocked rifles.They are very low maintenance and are more stable as far as holding point of impact than wood stocked rifles.I have owned a rifle with the boss system and although it worked to tune the gun for loads it was no more accurate than my other rifles without the boss.It also vibrated loose which resulted in changing point of impact.In your situation I would avoid the boss and choose the tikka in 7mmremmag.