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Why do you want to change out the factory stock? Is your objective one hole groups or something close to that goal? What distances do you shoot? Are you planning to compete? I think some more information would help others provide useful advice.
All of my shooting and reloading is centered on hunting. If I can get one inch groups out of my .223 and .243 (both Tikkas), I'm happy. I'm planning to experiment with different combinations of bullets, powders and seating depths to see if I can improve things, but right now the shooter (that's me) is the weak point in the rifle system.
If you want a challenge, try shooting from sticks (not a bipod) or a tripod that's not fixed to your rifle from standing, sitting and kneeling positions. If your range allows it, use small gongs instead of paper targets. Spray paint the gong and bullet strikes will be obvious.
I'm probably an outlier because as I learned very painfully with a .30-06 (not a Tikka), I could spend a lot of money on things like a new barrel, a new stock, a new trigger, having a gunsmith look it over, and other aftermarket improvements but at the end of the day the shooter is pretty important. That and a clean barrel. The '06 I could barely get to hit an 8″ target at 100 yards with factory ammunition from a bench now puts rounds in a 1.5″ group from a Vanguard T62 tripod. The only aftermarket improvements are a better trigger (gunsmith told me the originals were notorious for being stiff) and a recoil pad. The ammunition is Wolf's steel-based cheap stuff.
My short answer is, right now you'd be wasting your money unless you want to change the appearance of the rifle.
