Honestly, I don't understand why a round having more penetration is a good thing. As long as a round can get through clothing plus 6-8 inches of flesh it seems like that would be more than sufficient for self defence purposes.
Measure from your outer shoulder to your mid sternum.
How many inches did you get?
I measure 14" from outer shoulder to mid-sternum, and many guys are broader in the shoulders than I am.
So if I were standing sidesway toward you, your round would have to penetrate 14" of tissue to reach my heart.
And most likely your round would need to break through my humerus and some ribs and rip through a lung before it got to my heart.
6-8 inches of penetration simply cannot do that....it would barely make it through my upper arm.