Originally Posted by Bilbo Bagins
Here is a video with Clint Smith from Thunder Ranch on various shotguns for Home Defense, including a single shot similar to the OP's setup.
With some practice, enough shells, and a good defensible spot, you can repeal borders all day long.
Defensive Shotgun - YouTube
You know, that hat with the stiff brim is very necessary... I tried the same thing he did with the single shot shotgun and the ejected shell went promptly in my eye... and the next shell bounced off my forehead, hard... just watch the segment where his shells actually bounced off the edge of the brim or top of the hat.
Yes, it hurt pretty badly.