It's easy when you write the script, but let's not pretend it's the real world. If you end up in a trial then it's not because of what bullets you use but either it can or cannot be an issue. One way of eliminating it as an issue is by using commercially available rounds that police find acceptable for duty use. The possibility that it will matter is very small but I on't see any reason to use hand loads in a carry pistol with all the options we have in factory ammo
The Police have no authority to specify any manner of self-defense rounds for private citizens -- that is in the realm of lawmakers. Texas does not prohibit the use of non-armor defeating hand loads for self defense. Lots of "gun gurus" only say to use commercial ammo because they make a living from hawking "commercial self-defense ammo."
So, I have some Speer 9mm Gold Dots, some Speer 9mm brass, and some CCI small pistol primers and assemble them with whatever brand of powder I have on hand. The bullets and cases recovered in a shooting will be Speer. GSR will only say that a round was fired -- not the powder used to propel that projectile. I doubt anyone can prove they were hand loads (set your CSI fantasies aside).
Further, If I were to assemble a load "hotter" than a +P+ load commercially available, I'd most likely blow my handgun to pieces.
The fundamental issue is shoot/not shoot. What the goblin was shot with has nothing to do with the legally defined decision to shoot.