Tikka accuracy problem

Get the copper out as others have said but also make certain there is no carbon in the throat area. I use Wipeout followed by using JB Bore Brite on a jag in the throat area 3 or 4 inches back and forth to poish the throat and get rid of the rest of any carbon ring there. A decent bore scope would help you - or take it to a good gunsmith to help with that.

Personaly, I would replace the stock with a bell&Carlson Medalist stock with the full aluminum bedding rather than waste time with the plastic one.
 
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Good news
Went to the range today, before headed to the range, I cleaned the bore with copper solvent, tighten the action screws, make sure the barrel is free floating. Loaded up some Barnes TTSX 130gr with H4831sc, shot 4rounds groups, the rifle likes 60gr to 58gr of powder. The 60gr group, 3 shots are touching but I pulled the last shot. The rifle preformed very well, very pleased with the results. Only issue now is my trigger finger, it's been too long since I shot a long action rifle. I believe without the pulled shots the rifle is capable of 0.75MOA.

The accuracy issue might be introduced by bedding the recoil lug, which caused the barrel touching the stock.

Seems like slow burning powder gets best accuracy with mid to max loads, and fast burning powder achieves best accuracy with mid to min loads.

270WIN, 130gr bullet with H4831sc, start from 60gr, then step down.
223REM, 55gr bullet with Varget, start from 55gr, then step up.

Hopefully these information will help other new reloaders, Barnes bullets are too expensive for range shooting... ...

I really appreciate all your helps
 
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Everyone is quick to dismiss rifles when they don't achieve MOA or close to it. Often, as evidenced above, there's simple reasons for inaccuracy. Action screws, scopes/mounts, lead/copper fouling, etc. Every Tikka I've owned have been excellent shooters.
 
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