MG arms will make you a muzzle brake the same contour of your barrel and it will be perfection have one on my winchester model 70 300wsm and its a pussy cat and ive even got it in a light weight stock.

i would also consider having it pillar bedded, then there will be no change in zero and allow you to torque your action screws and keep them snug at the appropriate pounds, Every one of my wood stock guns are pillar bedded and the recoil lug and action glass bedded and point of impact never changes regardless of hot/cold, dry/wet weather.

I am not sure of the measurements but no problem with bergers, lrx, or any of the longer bullets thus far.

all my Winchester model 70 have shot MOA with factor ammo in 270, 300wsm, I sure hope the Tikka Does.