Eight Gauge is a shotgun cartridge that is so large and powerful that it is basically only limited to hunting dangerous game. Burt Gummer has a double-barreled elephant gun chambered in brass 8 Gauge lead slugs, since the pressure is too much that it would melt conventional plastic wrap.
Eight gauge is prohibited for duck hunting, and is rare in the United States. However, it is still used in many parts of the world (notably Britain) for bird hunting. Its shells are usually black powder paper cartridges as opposed to the plastic/wax cartridge and smokeless powder of today.