I have shot lots of deer with my Xcalibur and only had one jump string. Most of my deer are taken at 20-30 yds.They never knew what hit them. The one that jumped was 52 yds. I know my bolt drops 12" at that distance and aimed accordingly higher. The dang deer ducked down(jumped string) and the boltgrazed it over the back enough to break off one blade from a 4 blade muzzy. Blood trail only lasted about 50 yds. If I had held right on the body the deer would have dropped enough to center it. I think at that distance the deer saw the arrow and had time to react.