Went to zero my Tikka today after getting it screw cut....first 2 rounds missed the target at 100m, checked the Northstar moderator - to find a ding in the end! Thought the mod might have worked loose, so screwed it tight before trying 2 shots at 50 yards...missed the target again! Dropped the scope down 30 clicks...and clipped top right corner (18 inches from bull). I then removed the moderator, and put 1 round straight through the bull. The rifle is now back with the dealer for him to try and sort out....any suggestions as to what I should do? 1 damaged mod (which I'm told will still function), and possibly going to have to loose an inch or so off what started out as a 20 inch barrel. The morale of the story...be bloody careful who you trust to do anything to your rifle!