My coworker is a sport shooter like you would see in the Olympics. His club noticed differences in grouping patterns between different bullet manufacturers. He

My coworker is a sport shooter like you would see in the Olympics. His club noticed differences in grouping patterns between different bullet manufacturers. He built a sorting machine using python, 3d printed parts, and image recognition. It sounds similar to penny sorting by date and weight. He sorted by looking at the stamp on the shell and verified they weighed a certain amount.