“accidental self-inflicted gunshot wound” to the head.
Accidental discharges of firearms are few and far between. There are, however, lots of negligent firearm discharges.
People like to label things as accidents as a way on avoiding placing blame, negligence, or stupidity.
Anyone with a basic knowledge of firearm safety would say that the person handling the firearm was doing so in a negligent manner, which resulted in their death.
I think the correct term nowadays is “erupted”.
You kno, like when, shootings spontaneously erupt every weekend in Chicago.