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I think this article does a little bit better explaining them along with some graphics:That helps, but I'm not a math wiz by any stretch. I understand the definition (hence the big picture), just not sure on some aspects of the info the app gives us.
I'm just trying to understand the key differences of MEAN RADIUS as compared to GROUP as given by the app results.
The app is saying I'm holding a .55"MOA MEAN RADIUS and 1" GROUP. Is the term GROUP the same as saying EXTREME SPREAD?
I'm not a deep diver in PS. I'm just a tadpole.
Get the free Hornady app and never look back. I've used them all and there is none better, it includes something called Zero Angle which is a new way of getting your zero.
Does the Hornady app measure the mean group size or CEP — or only the inefficient "extreme group spread"?
If it does, I am interested!!
Matthias
Here's a picture of the measuring data from the app. The mean radius is what it gives you, which is the average distance of every shot from the center of the group (the circled white X).
View attachment 8654459
Note: I used to use CEP a lot, but that involves a minimum of like 20-shots to get a decent answer. As my shooting progressed I now need what the Hornady app provides, which is how far off I'm from the center of the target and the mean radius. In this case the target size is1/4 MOA center and 1/2 MOA circle. Each red square is 1/2 MOA (at 100 yards). Notice I have an exact distance of 106 yards (that's my laser measured range and it makes a difference).
As far as I can tell, you get the Hornady 4DOF app for free. On its home page is a button for the Group Analysis which you have to buy for $4.95...at least in the Apple store.JAS-SH,
thanks a lot for your input — yeah, mean radius would be sufficient for me.
Now, I tried to find the app in the Google Playstore, but I don't seem to find it:
One is a ballistic trayectory app,
the other a reloading data collection. Nothing mentioned about measuring precision of shot groups....
What am I missing?
Thanks,
Matthias
View attachment 8654587