This clarification is from the minutes of the TG meeting at Winter Range 2017:
When is the penalty earned in the situation where a cocked revolver is holstered?
"When hand is off the gun. (Answer was researched in current ROC clarifications and discussions). When a cocked revolver is holstered, and the shooter removes their hand from the grip, the appropriate penalty will apply (can’t be rectified). Whether there is a live round, empty casing or empty chamber is below the cocked hammer is irrelevant – it is the cocked revolver which earns the penalty – SDQ."