All you are doing is proving the shooters capabilities not the rifle then ?Use logical thought process here. If someone can not shoot 10, 20, 30, or 100 shots consistently without having a seizure behind the rifle, then that same person can not shoot 3 shots or 5 consistently. The worse a system is, the more data points needed to see the average.
Point in fact, if someone is producing errors, they have to shoot more shots per group, not less to have the same total confidence factor.