About two years ago I did a self assessment of stopping power. Friends and myself made targets out of newspaper. Stack it about a foot deep and wrap it in tape. We each had one. One friend used Glazer, another used JHP and I used Hydroshock.
The JHP and Hydroshock both penetrated but not like the Glazer. The first two plugged but not the Glazer. It went in about 6 inches with great deformation. The others not as far and did not fully expand.
We used 9 mm’s.
Now I carry a Rock Island single stack 1911 with a bull barrel. 9 mm is now my back up.