Measuring Groups

[chkunz]

Most folks measure group size by measurement of the “extreme spread” of the group. That is, the distance between the two widest shots. This is quick and easy to do and the way most folks do it. However, this method has the disadvantage of providing limited information on the actual performance of the rifle and ammunition. Another method of measuring groups is “Mean Radius” which is the mean of the distances of all shots from the center of the group. This method provides additional information over that of the extreme spread method. The disadvantage is that it takes more effort to obtain. If you would like to experiment with the Mean Radius calculation follow the link below. http://www.ar15.com/forums/topic.html?b=3&f=16&t=512887

 

[jcampbellsmith]

This gives another perspective on group sizes - http://www.the-long-family.com/group_size_analysis.htm Regards JCS

 

[chkunz]

This gives another perspective on group sizes - http://www.the-long-family.com/group_size_analysis.htm Regards JCS

Excellent reference, thanks. Mother Nature is a bitch.