As I recall there was a guy down in Texas who shot his revolver. A double action .357, using it single action and hit a gunman who was shooting at a police officer. I want to say he was around 50 yards way. The gunman had killed someone somewhere. The citizen saw things unfolding and shot the bad guy in single action mode.
10 year ago or more. 15 maybe? I vaguely remember reading about it.