Here's another pic for reference. I'm a small guy, (5'8"/155lbs) so take that into consideration. It's ridiculous.
Like I said, it's not practical at all, but that didn't stop me from wanting to shoot it. I shot my 1911 directly afterward, and it felt like a pellet gun. Iirc, the .500 ammo was 500 gr.
It looks like a prop in a vaudeville act.