Also note that I have read Fackler and he stated that 12" is by no means a maximum and is in fact a minimum. There are certainly times when more penetration is advisable especially shooting through barriers in order to take out hostiles
It is clear that you have an agenda to promote the .7 but IMHO a 22 ain't where it's at when my life is on the line.
I have MacPherson's book
I also have this one
Penetration is by far the most important atribute of a sefensive cartridge IMHO and in my experience in the game fields
The 5.7 is an interesting concept, but certainly not my cup of tea for a defensive handgun