Even though I just sold a tikka purely due to lack of use, I do look with a real skeptical eye to used tikkas for sale.I scrolled through all of the threads on here about Tikka and came to the conclusion that you should sell that rifle and use the proceeds to take up crochet. It's impossible for a Tikka to shoot poorly, both mathematically and spiritually. Then again..........
Or, you should start a process of elimination. Scope, mount, bedding, ammo. I'll state that some rifles never shoot well. I've fixed more than a few that suffered from this issue. Most were re-barrelled. Oddly enough, all of these, as I think about it, were purchased USED. Hmmmm.
Jeremy