Why don't they make pointed shotgun slugs?

Because it's pointless. No, really. The reason bullets are pointed is for aerodynamic reasons. Just like all the pointy stuff on this plane. The pointy shape makes for less air resistance and allows the bullet to fly farther. read more

Shotguns that are made specifically to shoot slugs are also now produced, and just like rifles and handguns, they have rifled barrels. The company known as Hastings produced one of the first rifled barrels for shotguns, and both the accuracy and range of a slug gun wearing one of these barrels made it possible to take effective shots on game at ranges out past 100 yards. read more