Some people just have to shoot the biggest, baddest, meanest gun they can get their hands on. Right now the king of the heap is the 4 bore rifle, shooting a 2000 grain solid copper or lead bullet. The shell is 5 inches long and 1 inch around. The recoil is, as you can imagine, out of this world and the muzzle energy is around 9000 foot pounds. That equals quite a handful. The guns aren't cheap either, and they are all custom made, as few mainstream manufacturers want the liability.
There isn't much of a case for necessity for these arms, as a standard 30-06 can kill anything in North America. However I did just see a notice in the local community paper about the circus coming to Batavia for a weekend. And they've got elephants too. Possibly mad elephants. Maybe I do need one of these.
Century Arms in Australia will build me one for US$35,000. It is just a single barrel, and I better make it count because each shot will cost 85 bucks (on Gunbroker.com).
Video from WeberMarkin's channel