I can't see the purpose or even why one would want to do something like the OP suggests. If I wanted to show a good 3-shot group then I would just keep shooting 3 shot groups until one was shot that would meet the standard to be posted.
A better indicator to me of how a rifle groups is a series of five or more groups on the same target, whether they be 3 or 5 shot groups. Anytime I see a target that is a sample of only one group does not mean much to me. Oh, and please leave off the dime or penny that may, or may not, be covering the "flyer".
drover