glaukon
My point of view is there are two gross catagories of pistol reloading events.
Reloading when you choose to
and
Reloading when you have to
Reloading when you choose to is a nice easy affair that is done during a lull in the action. It is frequently covered in this forum and at most training courses. On the other hand, forced to reload when you have to, as in your ammo supply is expended is in real life the most common event. Most of the time you will not detect the slide locked back, so their is no reason to dwell or practice "slide locked back awareness". My advise is to polish an emergency reload to counter the problem. As soon as you become aware that the trigger is no longer doing it's job, slam another mag in the gun and stay engaged with the target.
R1145 try hard not to fall into the trap of counting rounds, this is one of those things that works somewhat well at the range, but falls apart once stress enters the equation.
We have more than enough to think about in a gunfight, besides what condition of readiness our weapon is in, where it shoots to, or how it works.
Good Luck & Be Safe