OK, you missed, sorry to hear it , but it happens to all of us. WHY did you miss? have you solved the problem yet? Miss judge the range, faulty equiptment, sights off, shooting through brush, too windy, not enough practice, moveing targets? What happened? Can I/we help in any way?
The only real difference between a good tracker and a bad tracker is observation. All the same data is present for both. The rest is understanding what you are seeing.