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Foster SlugA Foster slug, invented by Karl Foster in 1931, is a type of shotgun slug designed to be fired through a smoothbore shotgun barrel. The defining characteristic of the Foster slug is the deep hollow in the rear, which places the center of mass very near the tip of the slug, much like a shuttlecock. If the slug begins to tumble in flight, the drag will tend to push the slug back into straight flight. This gives the Foster slug stability and allows for accurate shooting out to ranges of about 75 yards (about 75 meters). Most Foster slugs also have "rifling", which consists of thin fins on the outside of the slug that are used to impart spin as the slug travels through the air. Once the slug is spinning, it becomes as stable as a bullet fired from a rifle.
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