
Maybe it's not so accurate but It's better than nothing...
So in blue, there is the optimal load but it works also in green. The white cells don't have enough penetration. In yellow, the penetration is just a little bit under the limit (1 mm less)
Sorry for the units but it's easier for me. So the Load are in grams not in Grains and the distance in meters.
I have made also a link in the waterfowl part of the forum.
cheers