Mate that's kind of up to you.
I know that with the right powder that the performance you can get from a 6.5x284 is a healthy bump over a creedmoor no matter the barrel length. But much like a PRC, it's more overbore and will root the barrel a lot quicker. Probably somewhere around 1100-1500 rounds.
I think your biggest issue will be finding a gunsmith who will do the work. A lot won't touch tikka barrels.
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