Also important to mention here, because this info is supposed to be for treating the gunshot wound in SHTF, and that means dangerous environment that your first and most important thing is your own safety.
You can have state of the art equipment, but in real life gunshots and fighting, because danger to get shot, your task is usually be to plug the hole, stop the bleeding and move to safety.
Later you gonna pay attention to irrigation,sutures and whatever.. Sometimes you gonna be forced to move the victim first while he bleeding severely, and treat him when get to safety.
But do not make mistake of getting yourself too busy in looking to the wound while bullets flying, otherwise you may end up dead.
In real life SHTF too many folks died because “blind” wish to help other folks.