Self inflicted gunshot as a cause of death is at least in an American English a term that means suicide by gun. If someone died in a manner you described it would be called death by accidental shooting no matter who pulled the trigger. They would add who the shooter was later in the report. Maybe our British or Australian friends can comment if these terms are used outside of North America regarding death from firearm.
As a Brit I can confirm that it did not seem an unusual term to me.
Personally I interpreted it as a more generic term that can cover both intentional suicides and accidents - but I would not claim to be certain that I'm representative of my compatriots in this.
How about adding suicide? Not that I would have known either of them anyway :D
Personally I interpreted it as a more generic term that can cover both intentional suicides and accidents - but I would not claim to be certain that I'm representative of my compatriots in this.