Is that an app or software or what that calculates your group size??
Thanks, and yes, it's OnTarget Precision Calculator. You can get a free version if you Google it. I use the full version for work but the free version is more than good enough. You tell the program the size of the target e.g. I entered 5.900" for the vertical dimension of the outer grid since that's what my caliper says it is. You enter the bullet diameter, range to the target, select each bullet hole, point of aim, and the program calculates a bunch of useful information. I've compared OTPC results to groups measured with calipers many times and it's very accurate.
