When you practice, concentrate on getting the first shot in the heart area. Lay the gun down and walk away after each shot.
Lots of pistol shooters fall into the habit of hollowing out the target with a lot of shots. Treat the pistol as if each shot were the only shot you had.
“Lay the gun down and walk away after each shot.”
Horrendously bad advice, primarily because when your stress level goes up, you fall back onto what you have practiced. If you follow this procedure at the range, you are likely to stop after one shot when under stress. Much better would be to practice the “two to the chest, one to the head; pause to assess effect, repeat as necessary”, or any other sequence you desire/prefer. Laying the gun down after one shot will train you to expect instant results, which rarely happens.
RMMV