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TARAN -- Target Analysis software -- Intro

How often we see Internet snipers posting 5 shot groups to "prove" precision of their rifles, and other Internet snipers drawing thoughtful conclusions on that basis? I have seen too many; anyone of us who has shot more than one 5 (or 3 or 10) shot group in his life knows how different the results can get due to sheer random statistical variance. Furthermore, besides the warm feeling of posting a nice group to a forum, the knowledge of the size of a 5-shot group does have zero practical value. The main purpose of the exercise is to know the probability to hit a given size target at a given distance; to this goal, a 5-shot group size is totally useless. Sigma, R50 or R95 are good, practical indicators of the actual spread.

How do we properly measure rifle precision -- what method, how many shots? This question actually does have precise scientific answers. Many people have thought these thoughts before; for example:

This guy: https://github.com/lstange/mcgs

And these guys: http://ballistipedia.com/

And anyone listed here: http://ballistipedia.com/index.php?title=Prior_Art

(And pretty much any army in the world with enough money to hire a graduate engineering student.)

The science knows how to properly measure the precision of your rifle. The science also knows how to properly measure the precision of the measurement -- its confidence interval. Then why doesn't everyone do it properly? -- you may wonder. The answer is -- because it is complicated. We need to make it simple.

It all started as an attempt to scratch my personal itch -- to evaluate precision of shooter-rifle-cartridge combination with statistically valid and scientifically sound conclusions. Although it is possible to do it "by hand" with a ruler and an Excel sheet, it does require quite a bit of time, that I'd rather spend shooting.

Hence, automation.

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Page | by Dr. Radut