Well,your values are suggestive of a difference, but the the statistical significance of your trial is lacking - meaning that random variation could be leading you astray. But you do not have enough data to determine whether that is the case. Suggest you at least take the average of three shots (8 would be better if you can afford it) and then make a comparison. With eight shots, you candetermine the mean values, calculate the standard deviation, and then determine if there is a likely difference in performance...
On the other hand, just call the bird to within 30 yds .

-fsh