Why did your first thought consider the head?
Because it is really awkward to point your pistol at your chest.
Be sure you unload it and verify that the chamber is cleared, if a pistol, and the cylinder is completely empty if a revolver.
A four inch barrel will require a very uncomfortable twist to the wrist and the trigger finger is all wrong.
Of course a small pistol or a J revolver will be easier, but still will feel unnatural.
As for a gun being found at the scene, that means nothing unless the investigation can prove that the victim was holding it.
Even some of the cops in our earlier history when lawmen were frequently a rough lot, kept a pistol referred to as a “throwaway” to leave at the scene of a shooting....in case the victim did not have one.
Bill Jordan, a famous Border Patrol officer even mentioned the practice in his book.
Besides, who with a brain is going to keep a weapon with which he just committed a murder? And what better place to leave it if it is not traceable?
If a pistol then use your thumb in the trigger.
Then it lines right up.
Make sure it’s unloadeddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd