Stan, in the calculating of patterns whether it is a .410 or 10 gauge, the percentage is achieved by how many pellets are in a 30" circle at 40 yards. In order to get the percentage, the amount in the circle is then taken by how many pellets are in that load to begin with, whether it is #9's or #4's.
Both the .410 and 10 gauge can have the same percentage.

"If that is so, then the same pattern density delivered from a .410 will kill and break a target equal to a 12 ga. Don't get riled up yet, I'm going to qualify that. If the same pellet size is used, at the same velocity, and the pattern density is the same, the bird will not know if it has been hit by a 12 or a .410."

I think everyone will agree with that. It is all about putting the shot where it counts.
I did you did a good job explaining your point.


David