NROI Tips Watch the videos and read the associated information by clicking on the links below, or visit the Vimeo page to see all the videos. NROI Tips – Popper CalibrationNROI Tips – Equipment PositionNROI Tips – Target ConstructionNROI Tips – Overlays and ScoringNROI Tips – Magazine GaugingNROI Tips – Range Commands and RO PositioningNROI Tips – The 180NROI Tips – Start Positions