Slugs are the most powerful type of shotgun ammunition you can buy. Their projectiles are made of lead or lead fillings covered with copper. Sometimes they have a plastic tip that inflicts additional cuts and damage to the target. If you want to go hunting and kill a deer with one stone, slugs are definitely the best ammunition.
You can also make bullets less lethal by using rubber material for bullets instead of lead. There are many different ways to design slugs if you know how to make them. If you don't, you can buy a variety of types of slugs from your local hunting store, such as wad slugs, wax slugs, brenneke slugs, cut-shell slugs, host slugs, steel slugs, and plumbata slugs. All of them deal a different level of damage to the intended target depending on the material of the tip.
These calibers are just preferences; hunters have successfully used shotguns of all sizes when combined with the correct shotgun ammunition. When choosing shotgun shells, look for those of the same caliber as your shotgun and use the smallest ammunition that does the job. In modern times, there is really no difference in performance between high bronze shotgun shells and low brass shotgun shells. This is the most debated shotgun topic out there, including whether or not a shotgun is a good domestic defense weapon.
It is important to note that, like all shotguns intended for defensive use, a shotgun loaded with bullets must aim, not just “aim”. And yes, you can shoot 3-inch ammunition and any other cartridge smaller than 3-inch with a 3-inch chambered shotgun. The story of how shotgun ammunition developed is rich and varied, as are many stories in the history of firearms. Many choose to buy an interchangeable rifled shotgun barrel for their existing shotgun instead of a full shotgun.
These are found on their websites and have specific reasons for restricting certain types of shotgun ammunition.