So, your thinking the ammo manufacturers are not making advances in .40 and .45 projectiles right along with the 9mm?
The +P .45?
The "advanced projectiles" in 9mm are available in .40 and .45.
From the link.
There is little to no noticeable difference in the wound tracks between premium line law Auto enforcement projectiles from 9mm Luger through the .45 Auto
I take this to mean that they were comparing LE ammunition of similar technology across the 3 major calibers.