Formidable! Did you blokes know that S. Zihn (of this site) has just completed a 2 bore "rifle" for a fellow over on nitroexpress.com? Looks as if the bore is similar, however the new owner will not be shooting small charges of shot in it. I suspect the rifling might spread it as badly as a short barreled blunderbuss. I'd post pictures of the rifle, but wouldn't want to rob this thread.
Big guns are fun.
The picture above shows recoil isn't as bad as most elephant rifles - by the looks of the photobucket video. I propose they re-shoot the video with a full sized ball, instead of only 1/2 charge of shot. Still, my shoulder ached when I saw it.