Originally Posted by Swifty52
https://grtools.de/doku.php

GRT has an excellent group calculator built in and it’s 100% free. I looked at the OnTarget at one time from the link on accurate shooter, it worked well but I dumped it due to the fact it’s shareware/free to try, not free as represented. May be worth 12 bucks but I despise the intentional misrepresentation.

Thanks for the link, that'll keep me busy tinkering for awhile laugh