My theory of defensive pistol shooting is that target shooting is exactly the wrong thing to practice. I practice at all ranges out to 25 yards, but that's just because I love shooting. (That, and my annual qualification for my job requires 6 rounds kneeling barricade from both sides at 25 yards.)
Everyone knows about the Tueller Drill, where you practice drawing and firing before an attacker can cross 21 feet and slash you across the throat with a knife. It's good knowledge to have, but here's the problem: we cannot possibly keep our personal bubble at a 7 yard radius. A far more valuable drill in the real world is starting at about 30 inches (conversational distance), shoving/striking with your weak hand while drawing, rocking back (and drawing back your weak hand, for obvious reasons!), and firing two shots from the hip (retention position). Take a long stride back, center the gun and take a modified two hand grip (elbows bent, close to your body, gun out of reach of the attacker) and fire again, stride backwards again so that you have enough room to fully extend your arms, and fire again.
Most people who are comfortable with their gun will hit COM with all four shots. They'll definitely be in the torso; they might be all over the torso, but they will count, and they will buy you time to take more aimed shots if needed.
One of the most predictable things about teaching defensive gun use is taking a first-timer to the range, setting up a silhouette, and saying, "Okay, let's go walk up to the target and get ready to shoot." Every time, they will stop at 7-15 yards. And when I encourage them to keep walking closer, closer, their eyes get wider and they say, "Really? Here?"
Yup. Here. They're thinking the silhouette is a Bad Guy, so they don't want to get close to him. How close do you think you're going to be when you realize that "Oh, f#@$!, this guy needs shooting!"? It's not going to be when he's 15 yards away before angling quickly toward you with a "Yo! My man!" Bad breath distance is much more typical for initial contact. Whether or not your state requires "duty to retreat" before using deadly force, good tactics alone are reason enough to buy some space between yourself and the BG. If you're 25 yards away, that's time to hunker down behind some cover and think how you're going to get to your shotgun or rifle.
That's why I practice at 1 yard, 3 yards, and 7 yards. If you can hit the 10 ring at 25 yards, you can hit it at 1 yard, but if you can't draw and deliver at 1 yard, you might not get the chance to get 25 yards of space.