Please note.
The Geneva Convention does not cover types of weapons and how they are used. It covers actions of MILITARY forces.
It is the Hague Convention that covers types of weapons.
They are both publicly available if you want to pour over several hundred pages of Legal Speak.
The argument of what is "humane" is a moot point.
The argument is if an individual "Feared for their life and the lives of those around them and was only trying to STOP the actions of the individual as quickly as possible".
BTW, Even the NYPD went to hollow-points after several multi million settlements based on their officers having several situations where they had shot completely through a suspect and the projectile went down range, sometimes through several walls, and hit someone else.
Even if you are looking for a caliber sized hole you have nothing to lose with a conventional hollow point. If you miss, and most highly trained individuals miss more than they hit, the projectile will expend more of its energy with every board of dry wall, door, window, object that it strikes. A Full Metal Jacket will only stick together and penetrate these.
The only reason you should choose a FMJ projectile is
1. The firearm will not feed anything else
2. There is nothing else available
Police don't use FMJ ammo. Hunters don't use FMJ ammo. It's good to have fun with and that's about it.
Pistols are firearms of convenience, not very powerful, just handy.
The real power houses are Rifles and Shotguns.
Pistols punch holes in things, Rifles and Shotguns Destroy them.
The best site that I know of for testing projectiles.
For your reading pleasure.
http://www.theboxotruth.com/