"Bullet designs like the...Hydra-Shok...were state of the art 15 or 20 years ago. These older bullets tend to plug up and act like FMJ projectiles when shot through heavy clothing; they also often have significant degradation in terminal performance after first passing through intermediate barriers..." - DocGKR
Considering the above is 45ACP preferable to 9mm in the Hydra-Shok line?