Inkscape extension to calculate mean precision circle, mean horizontal and vertical components, and extreme spread for a shot group.
- download and install inkscape https://inkscape.org/
- copy target.py and target.inx to the directory specified in Edit->Preferences->System->User Extensions
- scan in some targets
- import a target into inkscape
- draw some circles over the hole locations
- select the circles
- go to extensions->render->target
- enter your target distance (100 yards by default)
- click Apply and get something like this...
Here is a sample combining many shots from 15 targets...
keywords... shooting, target, analysis