Lessons from top instructors:
USCCA
USCCA Quick
Colion Noir
Paul Harrell
Jerry Miculek
Examples from real life (Active Self Protection):
Chamber Empty Carry Leads To Predictable Disaster
Empty Chamber Carry Costs Defender His Best Opportunity
This is Why You Carry With A Round in the Chamber!
This is Why You Carry Your Defensive Tool Chamber Full
Another Reminder to Carry Chamber Full
A Stark Reminder to Keep Your Defensive Firearm Chambered