Final answer:
The swing thru technique involves starting the shotgun barrel behind a moving target and swinging it through to maintain speed with the target before firing.
Step-by-step explanation:
The swing thru technique with a shotgun is a method used predominantly in wing shooting, where the shooter starts the shotgun barrel behind the moving target, accelerates the barrel to match the target's speed, then swings the barrel through the target and fires while continuing the motion. As opposed to methods like "sustained lead" where the aim is kept ahead of the target, the swing thru requires good timing and fluid motion to maintain a continuous swing until after the shot is fired. It is one of several techniques that can be employed when shooting at moving targets, such as birds or clay pigeons.