Gunshot wounds to the head are fatal about 90% of the time, with many victims dying before arriving to the hospital. For victims who survive the initial trauma, about 50% die in the emergency room.
BUT , caliber and type of bullet is important, small bullets will enter your skull and have a chance to not come out and leave you in agony or not kill you at all, while full metal jacket ones will make two holes and wreck everything in his path , even exploding your head no mather if you shot your mouth or temple .
I have a gun but is my last resort for when the NCMEC Google slaves came