What are the biggest guns called?

Answer 1

The VERY biggest guns are cannon- one type of which is called a howitzer. Cannon such as the German railway guns (so big they moved on railroad tracks) could fire a shell 75 miles. The cannon on a battleship (called rifles) can fire a shell that weighs more than a ton about 25 miles. For guns fired from the shoulder, the largest were likely some of the very large shotguns- one such was the 4 gauge shotgun, and fired about a half pound of birdshot. Some of the very large rifles were the express rifles. These were usually doubled barreled rifles used by hunters in Africa for very large game, such as elephants and rhinos. One such express rifle was the .600 Nitro Express. But the largest rifle fired from the shoulder was probably the 20mm antitank rifle from World War I. It weighed over 20 lbs, and fired a bullet just under one inch in diameter.