Yep, but getting that barrel off can be quite a trick. So, OP was thinking to buy a new Tikka with one of the calibers he wants and buy a second barrel (or more) for the other caliber.All you have to do is remove the OEM barrel. After that, it's like swapping out a shouldered barrel on any other action.
But I’ve seen too many stories, incl from my very good friend, that very often relief cuts needed to be made to get the suckers off so there goes that barrel.
I just think, as many here have pointed out to him, that there are better options for what he wants to do, right?