Taking all of this information and applying it to Warships equivalents, It means that that sigma shows how consistently or how close the shots can land relative to each other(precision) not how accurate your shots are. These 2 systems cannot be directly be converted nor translated so in the competition shooting world they often do this thing where shot consistency/precision is measured via R50 and shot accuracy via the American method. In world of warships terms, that would be dispersion. The American system on the other hand just simply takes the smallest possible diameter that can fit all the shots in or overall accuracy. Sigma basically denotes the R50 accuracy/consistency of those fired but does not take into account the maximum dispersion and hence basically ignores the shot that lands outside of the Denoted R50 circular area of error. They then use both the vertical and horizontal measurements of the reduced groups to measure accuracy.Īnd this is where sigma comes in for me. This dramatically reduces the overall diameter of the groups. They then disregard the hits on the outer part of the target and only count half of the hits (50% or R 50 ) on the inner part of the circles. They then draw two circles on the target, one for the maximum vertical dispersion of hits and one for the maximum horizontal dispersion of hits. For those who who are unfamiliar with R50, it is basically the european system of calculating rifle shot accuracy by taking the circle of the largest vertical spread, and the circle of the largest horizontal spread, then taking the area in which they overlap, and then having 50% of the most closely grouped shots to the center measured to give an accuracy rating. It seems like it is based off of the R50 system of calculating shot accuracy. The more I look at dispersion and sigma, the more I start to see a trend.
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