A buddy of mine bought a SiteLite SL-150. We used it to sight in my Marlin Slugmaster 12 gauge. We did everything the directions said. We leveled the gun, then placed the target 25 yards away. Put the laser on the dot of the target, which is 1 inch below were you place your crosshairs. I used this gun out in the field the next day. Missed 2 deer. Couldnt understand what happened. I took the gun out and shot at my target in the field. 6 inches below were I was aiming!!! I sighted the gun the old fashion way. Its on it. What did we do wrong? The deer I missed were no further than 35 yards away.