If you're not aware Tikka T3 / T3x share the same action length. So that will allow you to use short or long action with just swapping the bolt stop and magazine. Long action you can run it as is with short action cartridge's and just have longer bolt throw.
So all you need to do is decide on magnum or non magnum bolt face.
Bonus is the long actions chamberings tend to sell for a little less than the short actions.
Edit. : Oh i see you're after magnum bolt face. Be easier and cheaper to get a magnum rifle to start with so you dont have to open the bolt face
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