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Tightness of shot groupings are calculated by measuring the maximum distance between any two bullet holes on the target (center-to-center) in length measurements such as millimeters or inches. On the other hand, the grouping displacement (the distance between the calculated group center and the intended point of aim) is a measure of accuracy. The tightness of the grouping (the proximity of all the shots to each other) is a measure of the precision of a weapon, and a measure of the shooter's consistency and skill. In shooting sports, a shot grouping, or simply group, is the collective pattern of projectile impacts on a target from multiple consecutive shots taken in one shooting session.
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The group on the right measures about 7 mm and was fired at about 90 meters, which equals 7 mm / 90 m = 0.08 mils ( 0.3 in group at 100 yards, approx. The group on the left measures about 13 mm and was fired at about 45 meters, which equals 13 mm / 45 m = 0.29 mils ( 1⁄ 2 in group at 50 yards, approx. Two shot groupings obtained with different firearms at different distances.