Pull it apart !! Clean it with a oily rag and put it back together -it must have a floating barrel or yes it could disturb your zero.Run a piece of paper from the barrel end down the channel toward the action and you'll soon know if its floating or sitting against the stock which will possibly cause a moving zero anyway.Barrel cleaning , just get some carbon remover and get that crap out and leave the copper -your a hunter and don't shoot enough to clog the thing and I believe the barrels are not to bad on the Tikkas so you should be able to put hundreds of rounds down range without to much zero movement
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