Calling your shots in no new technique and not derived in the sport of practical shooting. I first learned to call my shots in the Marine Corps on the rifle range. We called every shot in a record book. Take the shot, plot the "call" and repeat. Rifle and bullseye shooter have done this for years. There is no mystical talent required. Just see (call) your sight relationship to the target the instant the shot is fired. Now doing this at the speed we shoot in practical shooting takes some getting used to. And is more difficult than one shot at a time. But with practice, it is acheivable. It is just something that most shooter lack to do on a shot to shot or match to match basis. There are times I know where all my hits are, and there are times when I get lazy and don't call every shot. It is easy to get caught up in the moment of blazing away, and while it is fun, it isn't as productive consistantly.