What is the author's primary concern when firing test groups?

The author's primary concern when firing test groups is the shapes of the groups. This aspect is crucial in accuracy assessment since the dispersion of shots in relation to one another indicates how well the rifle, ammunition, and shooter are functioning together. A tighter group suggests better accuracy and consistency, while a wider spread might indicate issues that could arise from any of the influencing factors, such as the rifle's condition, the shooter's skill level, or the ammunition's performance. Understanding the shape of the group allows for effective evaluation of the overall shooting performance and aids in diagnosing problems that may need addressing to improve accuracy.