If there was a problem with the rifle as the way its beded or lose scope etc it would be consistently Inaccurate and wouldn't shoot a 1moa group one week and shoot like scattered buck shot the next.
My advice put it back together, torque the action down correctly. Don't use anything with copper remover to give it a clean, go shoot a box of ammo down range, go home clean it with solvent like carb cleaner. Keep doing that till you notice the groups starting to open up (probably after 150 rounds) once that happens your copper equilibrium is to much so youl have to really get stick in with your hoppes 9 and bore brush to clean it out. Now the accuracy and groups will be up the shit again till you have resettled the copper equalibrium again (my tikka took 20 rounds to Settle down). It is not necessary to clean the copper out after every hunt or trip to the range. You must be the only person with an Inaccurate tikka if this is not the case.
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