i have a few guns that do the same thing. not quite as far off as yours though. if it only does it on a clean barrel i wouldnt worry too much. just make sure you foul it before you hunt with it. but make sure it only needs to be fouled and not warmed up. dont clean it before you take it to the range next time, see if it hits zreo. if it does, clean it at the range and try it again, if it hits off, then you know what you need to do before hunting with it.