The FBI evaluate ammunition with pistol based on it's penetration through an obstacle through clothes and depth of penetration into target. This method was developed because of the Miami shoot Out which ended in FBI Agents dying because the 10mm round penetrated car doors, person and car doors, it over penetrated. I have also seen the results of over penetration in my stupid teenage years.
I figure it this way, does over penetration happen, yes, does it always happen, no, should I plan for it to reduce its possibility of happening, yes. It seems like a good way to reduce accidental injury or death.
Here to help
Jacob Rascon, (aka) Pennys Dad
CALGUNS Shooting Sports Association.
1. Blessed be the LORD my Rock, Who trains my hands for war, And my fingers for battle 2. My loving-kindness and my fortress, My high tower and my deliverer, My shield and the One in whom I take refuge, Who subdues my people under me.