Something I normally screw up.. Have several "extra" ring sets because I picked the wrong height. 50mm objective 30mm tube. In a Sako it would be low rings. In a Tikka high rings? This is a T3x so I believe that it is tapped as well so may not need the rings for the rail.
It all depends on the type of rings and how they mount. If I mount directly to the receiver, I need high rings. If I mount to Warne bases, I use mediums, and if I use a picatinny rail, I can use lows. The rings that I use are Burris Signature rings.