great gun. talleys have always been good to go. Get a recoil pad, and replace the stock bolt shroud. Might as well do it now before it breaks or starts rattling. in that caliber, just like a 300 win mag, the tikka will kick like a sob. hence, be meticulous when mounting your optic.
I didn't trust the factory rings on my T3 300 WSM so I added an EGW base and Warne rings, very solid setup. Warne also makes T3 rings that have a recoil stud that drops in the hole on top of the receiver, another very solid setup.
When installed correctly (and carefully) the stock rings are adequate but Tikka discontinued inclusion of them with the T3x rifles for some "good reason" I'd imagine - All mentioned are good ring/base combos - I use Mountain Tactical rail and Leupold PRW rings and have had 0 issues whatsoever - I use the MT rail because they build them to incorporate the lug recess on the Tikka bridge with a recoil lug, may not be "needed" but sure doesn't hurt anything either and there's reason for every design feature in every action I believe