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Marking the X. The X represents the center of the three shots. When two shots are near one end of the group and the third shot is toward the other end, the X is placed closer to the two near shots. This is not a precise marking that requires a measurement but is a procedure to help in shot-group analysis. The three-round shot group confirms the variation inherent in the rifle, ammunition, and firer. While some of the variation within a single shot group is due to the rifle and ammunition, the firing of more shot groups indicates any firer errors. (Figure G-4 shows three marked shot groups.)

Figure G-4. Central point of nine shots

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