I have been playing with my chrono today and I at a loss to understand the data I am getting. I am grouping 3 shots groups in a 5p sized group over 100yds time and time again, yet the ES on the chrono is massive (70), whats happening. If the groups were all over the shop I would understand the ES and sd being huge, but they arnt, so can anyone explain the results. The chrono is a Prochrono >>>> Prochrono Is the chrono busted ???