Shotguns range from breech loaded to semi-automatic. They can fire two types of shells. The buckshot which allows for a wider spread to give a better chance to hit targets. Or a slug to penetrate armor.
A shotgun (also known as a scattergun and peppergun,1 or historically as a fowling piece) is a firearm that is usually designed to be fired from the shoulder, which uses the energy of a fixed shell to fire a number of small spherical pellets called shot, or a solid projectile called a slug. Shotguns come in a wide variety of sizes, ranging from 5.5 mm (.22 inch) bore up to 5 cm (2 inch) bore, and in a range of firearm operating mechanisms, including breech loading, single-barreled, double or combination gun, pump-action, semi-automatic.