*This gun was far and away the biggest gun when it was made. The exact barrel weight is 103.64 tons, and the carriage it sits on is another 46.82. It is definitely the biggest ever muzzle-loader. There were other big guns, beach-loaders such as those on the Yamamoto battleship, or the German Schwerer Gustav railway gun, but these don't count because they have either been destroyed or sent to the bottom of the sea. Other later railway guns, some of which survive at least in part, were built that sat on massive railway carriages, and these weighed more.