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I don't own that caliber or model so these are shots in the dark.
Are you sure it's the rifle and not the shooter? I have had that problem in the past. How large are your groups at 200 yards? If you're hunting, 3″ is all you need to kill the game you'd be shooting at that distance. If you're competing, different story.
I hand load for a Tikka in .223 and another one in .243. My groups run around 1 to 1-1/4 inch. The .223 doesn't like Aguila's .223 made with once-fired cases and there was one other type that it shot badly. How many different rounds have you tried in that rifle? How are the groups at 100 yards?
