I can't speak for the Tikka T3 models, but I have owned a Tikka M590 and a M595 (both .308)...both had the same 'feature' of half closed bolt slamming down and firing pin hitting home when trigger released. The only 'safe' positions for Tikka are either fully open (noisy rattle and potential to lose the bolt and/or get foreign matter into receiver) or closed on empty breach.
A personal thing for sure, but I never "half cock". I'm either ready to fire, or cannot fire without considerable intentional effort
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