This is about shooting groups. The analysis is based on CBA NM records, 2000-2013.
Perfect shots go through the same hole, inaccuracy is caused by some elements. There are four classes of causes of inaccuracy, the inaccuracy elements.
EQUIPMENT, bullets etc. EQUIPMENT causes ~24% of inaccuracy
WIND, everything affecting the bullet from muzzle to target. WIND causes ~ 6% of inaccuracy.
SKILL, the ability of the shooter to shoot small groups. SKILL causes ~20% of inaccuracy between the first and second place shooters, with the % decreasing as “place” increases.
CHANCE/LUCK, the product of variation. CHANCE/LUCK affects inaccuracy in complex ways. Here is an example of 5 and 10 shot GROUP matches, with the shooters numbered 1 through 5. The shooters have shot a zillion matches, and are ranked by “place”, #1 through #5. Here are SOME of the outcomes:
#1 will shoot < #2 group size, 89% of the time.
#1 will shoot > #2 group size, 11% of the time.
#1 will shoot > #3, group size, 9% of the time.
#1 will shoot > #4, group size, 7% of the time.
#1 will shoot > #5 group size, 6% of the time.
EXCEL workbooks are available on request.