I too have had an ND/AD, and had to admit it to people that knew me as the most adament regarding the rules of safety.
Let me set up the Scene.
Older model 336 lever / no hammer block safety,
New purchase for me so cleaning and disasembly to familiarize myself w/ said weapon,
CLP all over my hands,
Used a Live round to "cycle" the action to assure proper reassembly.
Hammer slips from lube laden thumb,
Pop put a round trhough the ceiling and roof of the house I was renting.
Girlfreinds Cat does Nine foot verticle acceleration and unwinds like sack of rubber bands near apex. Not seen for two hours afterward.
Girlfreind has horrified look on face as she thinks I am a bloody mess in the bedroom.
Did I mention the ringing in my ears and the smoke detector screaming besides.
Snap Caps are a good invention and dummy rounds are good things too.
Fortunately the gun was pointed at the ceiling of a single story home.
I was so shocked I called a good freind who recomended cleaning and refamiliarizing myself with the gun again just to get over the Psch factor.
Safety 1st, last and always.