Moral of the story - don't use old, oil-softened leather holsters when carrying with a round in the
chamber.
It's not difficult to find these articles.
I'm sure it's not.
The bottom line is that you use your thumb safety while on the range after a round has been
chambered and you're daydreaming about what to do next. Once you've chambered a round you should be
in position to aim and fire the weapon. If and when the RSO calls a 'cease fire', you remove the
round from the chamber and remove the magazine, leaving the slide back. Then place your weapon on
the stand and move away from it.
Surely you're not allowed to simply put the thumb safety on and walk around (unless you're in the
woods killing stumps)