Originally Posted by JPRITT
I would bet $100 that your problem lies with those rings. Tikka makes a great rifle. I have owned two of them and all my shooting buddies have at least one. Everyone I have seen shoots at least MOA. Get rid of those rings and buy the leupolds. Millet also make some but the leupolds are better. Its almost like they put those rings on there as a joke.
+1 The aluminum Tikka supplied rings are trash.
I've written about the Tikka aluminum factory rings here sometime in the past. The front Tikka supplied ring has a steel pin that protrudes out the bottom of the ring into a hole in the top of the receiver. This steel pin will kick out towards the back side of the front ring under recoil, actually forming a bulge on the back side of the aluminum ring adjacent to the steel pin. I experienced it on both of my 7mm RMs Tikka T3s and others I know have also. That single steel pin is the only secure means by which the factory rings are mechanically held to the receiver. Other than that you only have the friction fit of the two rings on the dove-tail style grooves.
Replace the Tikka rings with bases that screw into all four of the tapped & threaded base screw holes on the top of the receiver. If you want the lightest rings available, go with Talley's lightweight rings. If you're not as worried about weight then there are a number of other ring & base options available that will securely hold the scope to the receiver and eliminate the scope creep you'll see with the factory "Cheetoos" rings.
I don't guarantee you'll shoot 0.5 moa after replacing the scope rings, but I guarantee it's a worthwhile improvement to your outfit.
BTW, my two 7mm Tikka T3's shoot the 160 gr ABs to about 0.6 moa. One of them shoots 168 gr Berger VLDs to about 0.3-0.4 moa. In general, the Tikka T3s are shooters.