A firearm target is specially adapted for the purpose of sighting in a scoped firearm. The scope has a reticle with horizontal and vertical lines forming crosshairs. The target has a cross pattern in contrasting colors with a cross shaped gap. The gap is highly visible and may even be in a reflective color. The gap size is selected to match the crosshair thickness and the targeting distance. Aligning the crosshairs to the gap significantly or completely hides the gap. Misaligning the crosshairs to the gap causes the gap to become more visible because of the gap's highly noticeable and contrasting colors. The target thereby provides a lock-on functionality for a marksman.