The newer 9mm ammo that was tested had deeper "wound channels" on the gel used. I also believe there was more mushrooming of the round as well. Whether or not those would be considered statistically significant is another issue.
Gel is good. Gel testing is useful. But I'm talking about the human body.
In the OR, or autopsy, it is impossible to tell the difference between a 9mm wound and a .45 wound except by measuring the bullet.
The wounds cannot be differentiated.
That's what really matters.
Sent from an old fashioned 300 baud acoustic modem by whistling into the handset. Not TapaTalk. Really.