Tikka are easy as they build them all on one action length.
You would need a magazine to accommodate the rounds. A .270,.30-06,.magazine length will accept the .280.
You need a different bolt stop.byhats easy to swap out yourself. You can file or grind some material off the existing bolt stop to allow the bolt to slide back the extra 1/4" or so.
It should be straight forward.
I built my .280 on a .25-06 but the .243 also has the right bolt face.
Because Tikka are modular buy yourself a handful of them, it's an easy swap between stocks and other accessories to reconfigure these for different purposes.