Do you ever practice reloading with one hand as though the other hand has been disabled or is required to keep you from falling. With a revolver, stuff the barrel in your belt once the cylinder is open, reload and close the cylinder as you withdraw it from your belt.
I have never practiced with a pistol and would have the slightest idea where to start.
At slide lock, drop the mag using grip hand finger. Stick barrel into pocket, belt, or between knees. Anywhere that’ll hold it steady enough to retrieve a spare mag and feed it into the mag well. Regrip, drop the slide, continue administering dirt nap pellets.
If still loaded, drop mag, place on safe (if equipped) secure (knees only in my view)with muzzle pointed safely away, insert mag, re-grasp, continue mission.
All this done preferably behind cover, even if still fully capable.
God Bless & MOLON LABE