Reply To: Wildcat .25 Chrony string
If you shot that string near the time that photo was taken, note the sun was fairly high.
The pellets would have had to travel through air of quite a variety of temperatures (densities) enough disturb flight more than the 2mph wind and to make me advise you to try again in early morning, ASAP after sunrise, when winds are gentle anyway. Most of the spread of your group is horizontal, which suggests varying wind.
The vertical spread is excellent. Especially considering it is a 53 shot group!