The ability to quickly reload a semi-auto handgun is the hallmark of an expert, and it involves a number of individual movements that can be broken down into simple, decisive steps. These should be practiced until they become a single, fluid motion.
Step 1: Dump the Spent Magazine**
As the slide locks back after the last round, immediately hit the magazine release button. With ambidextrous magazine releases (or a reversible release button for lefties), this is done with the thumb of the shooting hand. In the same motion, cant the magazine well inward 45 to 60 degrees toward the body's centerline to the side that the new magazine will arrive from. For a right-handed shooter carrying extra magazines on the left side, the mag well goes to the left. If your gun allows the magazine to drop freely, the support hand should already be off the gun and moving to the new magazine. If the magazine is not a drop-free design, the support hand lingers for a moment to strip the empty mag from the gun and discard it. These steps clear the empty mag from the gun and get it out of the way.