I use the app "range buddy".. it measures that for you "mean radius". If you keep a log of data, for example during load development, you can just jot down the number. I find that usually the mean radius is pretty close to half the overall group size (makes sense right?)
I generally like doing it this way b/c in a hunting situation I don't like to have a mean radius over 3" for the given distance I am hunting, in other words when I get over 3" mean radius I will not shoot further. Keeping me easily inside the vitals if I do my part.
The picture below is the target I use. I made a cutout with a 1" center circle, 3" circle, and a 6" circle. Here i only have the center dot and 6" circle painted. The lines of the circle are 1" wide.
My Grendel for example... when playing with seating depths.
![[Image: SnMbkeY.jpg?2]](https://i.imgur.com/SnMbkeY.jpg?2)
I generally like doing it this way b/c in a hunting situation I don't like to have a mean radius over 3" for the given distance I am hunting, in other words when I get over 3" mean radius I will not shoot further. Keeping me easily inside the vitals if I do my part.
The picture below is the target I use. I made a cutout with a 1" center circle, 3" circle, and a 6" circle. Here i only have the center dot and 6" circle painted. The lines of the circle are 1" wide.
My Grendel for example... when playing with seating depths.