New gun or not, I'd call Mossberg and tell them your story. They may want you to send it back. If they won't do anything, I'd remove the forend pressure. Guns normally tend to shoot away from pressure spots, so right-side pressure can mean left-side POI. Be sure you get your crosshairs re-centered in the scope. There may be other underlying problems as well... mounts on correctly and all screws tight??