Aside from the obvious average % of shot in a 30” circle at a given range , I guess you could grid your target and judge the kill potential by pellets per square.
That seems like a small effort for a reasonable return.
I just try loads through a new gun at clays and use what feels best.
Trying to score it on a static target doesn’t do much other than show a baseline level. Real use brings other factors, as you point out.
I guess that knowing that you have a dense pattern might provide some confidence in your gun.
There isn’t any magic to be found in a particular gauge.
Last edited by Tom Findrick; 08/10/21 11:10 AM. Reason: Phrasing!