The largest shotgun I have ever heard or seen is a 12 gauge shot gun used by cops that is capable of decapitating your head with just one shot. But, here’s the big daddy of all shotguns. This one takes about two people to move the gun from one place to the other. Since the gun is so heavy, it has to be mounted on the punts. Thus, the world’s largest shotgun is also known as a Punt gun. When mounted, the gun almost looks like a cannon. According to the reports, a single shot from the Punt can wipe out about 50 to 100 ducks. The embedded video shows the big guy lifting the heavy gun. I guess it would be better if we call it cannon instead of a gun. Due to the weight of the gun, the recoil is huge. So, you have to really watch out while firing. Basically, you can take out a whole case of clay targets stacked on a board with this big and long punt gun. The next longest model would be the shotgun like pellets assembled by the Indonesians. The pellets can fill about 50 Olympic swimming pools.