Thought of the Day

I talked to a guy a few days ago, a real gun nut, who informed me there are incendiary shotgun shells available to the public. He showed me a picture on his phone of these shells from a recent gun show he attended. Ten dollars for three rounds. How is there a market for this? And under what circumstances is an upstanding citizen using these explosive shotgun shells? The only thing that comes to mind is zombie apocalypse.