Tikka actions are one size: "long", They utilize different bolt stops and magazines to match the cartridge's length to the action.

So, you can buy a Tikka in a "short" cartridge ( ie 7mm--08), and either grind back the bolt stop ledge to allow the cartridge to be extracted further rearward (out to "long case", ie 30-06 size), then use Tikka long action magazines for longer seating options..

Or, buy a Tikka long action bolt stop, and use long action mags (270 Win/30-06).

Here is one source, but Brownell's and other places have Tikka long and short bolt stops.
https://www.mountaintactical.com/categories/tikka-t3t3x-action-parts

If you do get a Tikka, you may want to upgrade the factory recoil lug with a high-strength recoil lug. Easy-peasy DIY replacement. I did it on my Tikka T3 308 Win Varmint.
https://www.mountaintactical.com/categories/recoil-lugs

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