who needs 20 shots anyway, with a 9mm you need to be precise its a small bullet. With a .45 aim center-mass and fire away. That perp wont have a back left, the exit wounds will be so big.
My step-dad is an ex-sheriff and always carried a .38 snub-nose with 150 grain loads. He always told me it could kill a deer. Never beleived him til he hit my neighbor’s dog, and the guy asked him to kill it. Holy fuck was that a mess.