
The .410 bore is one of the smallest caliber of shotgun shell commonly available. A .410 bore shotgun loaded with shot shells is well suited for small game hunting and pest control. The .410 started off in the UK as a garden gun along with the .360 and the Nos. 3, 2 and 1 bore rimfires. .410 shells have similar base dimensions to the .45 Colt cartridge, allowing many single-shot firearms, as well as some derringers chambered in that caliber, to fire .410 shot shells without any modifications.

The 20-gauge shotgun, also known as "20-bore", is a type of smooth-bore shotgun that fires a shell that is smaller in caliber than a 12-gauge shotgun. It is often used by beginning shooters for target practice and for hunting small game.

A bean bag round, also known by its trademarked name flexible baton round, is a type of baton round, fired from a shotgun, and used for less lethal apprehension of suspects.

A blank is a firearm cartridge that generates a muzzle flash and an explosive sound like any normal gunshots, and the firearm experiences a recoil capable of cycling its action, but without shooting a projectile. Blanks are often used for shooting simulations that have no need for ballistic results but still demand light and sound effects, such as in historical reenactments, special effects for theatre, movie and television productions, combat training, for signalling, and cowboy mounted shooting. Specialised blank cartridges are also used for their propellant force in fields as varied as construction, shooting sports, and fishing and general recreation.

A breaching round or slug-shot is a shotgun shell specially made for door breaching. It is typically fired at a range of 6 inches (15 cm) or less, aimed at the hinges or the area between the doorknob and lock and doorjamb, and is designed to destroy the object it hits and then disperse into a relatively harmless powder.

A modern shotgun slug is a heavy projectile made of lead, copper, or other material and fired from a shotgun. Slugs are designed for hunting large game, self-defense, and other uses. The first effective modern shotgun slug was introduced by Wilhelm Brenneke in 1898, and his design remains in use today. Most shotgun slugs are designed to be fired through a cylinder bore or an improved cylinder choke, rifled choke tubes, or fully rifled bores. Slugs differ from round-ball lead projectiles in that they are stabilized in some manner.

Dragon's breath is a special type of incendiary-effect round for 12 gauge (18.5 mm) shotguns. Dragon's breath consists primarily of magnesium pellets/shards. When the round is fired, sparks and flames can shoot out to about 100 feet, although, some sources claim it extends to 300 feet. Dragon's breath is normally chambered in 12-gauge 2+3⁄4″ shot shells. The rounds are safe to fire out of an improved cylinder bore as well as a modified choke barrel, common on many shotguns.

A flechette fleh-SHET is a pointed steel projectile with a vaned tail for stable flight. The name comes from French fléchette, "little arrow" or "dart", and sometimes retains the acute accent in English: fléchette. They have been used as ballistic weapons since World War I. Delivery systems and methods of launching flechettes vary, from a single shot, to thousands in a single explosive round. The use of flechettes as antipersonnel weapons has been controversial.

A bean bag round, also known by its trademarked name flexible baton round, is a type of baton round, fired from a shotgun, and used for less lethal apprehension of suspects.

A shotgun is a long-barreled firearm designed to shoot a straight-walled cartridge known as a shotshell, which usually discharges numerous small pellet-like spherical sub-projectiles called shot, or sometimes a single solid projectile called a slug. Shotguns are most commonly smoothbore firearms, meaning that their gun barrels have no rifling on the inner wall, but rifled barrels for shooting slugs are also available.

The FRAG-12 is a specialized shotgun shell which contains small amount of high explosive to breach intermediate barriers, defeat light vehicles and disrupt IEDs. The shell was designed by the Special Cartridge Company in London, England. Later its patent extended to Olympic Technologies Ltd in Gibraltar.

Garden guns are small bore shotguns commonly used by gardeners and farmers for pest control. They are made to fire small gauges such as .410 bore, 9mm Flobert, or .22 rimfire shot shells. They are short range shotguns that can do little harm past 15 to 20 yards, and they are relatively quiet when fired with rimfires. These guns are especially effective inside of barns and sheds, as the low velocity small shot will not shoot holes in the roof or walls, or more importantly injure livestock with a ricochet. They are also used for pest control at airports, warehouses, stockyards, etc.

The gauge of a firearm is a unit of measurement used to express the inner diameter of the barrel.

A breaching round or slug-shot is a shotgun shell specially made for door breaching. It is typically fired at a range of 6 inches (15 cm) or less, aimed at the hinges or the area between the doorknob and lock and doorjamb, and is designed to destroy the object it hits and then disperse into a relatively harmless powder.

A sabot is a supportive device used in firearm/artillery ammunitions to fit/patch around a projectile, such as a bullet/slug or a flechette-like projectile, and keep it aligned in the center of the barrel when fired. It allows a narrower projectile with high sectional density to be fired through a barrel of much larger bore diameter with maximal accelerative transfer of kinetic energy. After leaving the muzzle, the sabot typically separates from the projectile in flight, diverting only a very small portion of the overall kinetic energy.

Shot is a collective term for small balls or pellets, often made of lead. These were the original projectiles for shotguns and are still fired primarily from shotguns and less commonly from riot guns and grenade launchers, although shot shells are available in many pistol calibers in a configuration called "birdshot", "rat-shot", or "snake shot". Lead shot is also used for a variety of other purposes such as filling cavities with dense material for weight/balance. Some versions may be plated with other metals. Lead shot was originally made by pouring molten lead through screens into water, forming what was known as "swan shot", and, later, more economically mass-produced at higher quality using a shot tower. The Bliemeister method has supplanted the shot tower method since the early 1960s.

A shotgun shell, shotshell or simply shell is a type of rimmed, cylindrical (straight-walled) cartridges used specifically by shotguns, and is typically loaded with numerous small, pellet-like spherical sub-projectiles called shot, fired through a smoothbore barrel with a tapered constriction at the muzzle to regulate the extent of scattering. A shell can sometimes also contain only a single large solid projectile known as a slug, fired usually through a rifled slug barrel. The shell casing usually consist of a paper or plastic tube mounted on a brass base holding a primer, and the shots are typically contained by a wadding/sabot inside the case. The caliber of the shotshell is known as its gauge.

A modern shotgun slug is a heavy projectile made of lead, copper, or other material and fired from a shotgun. Slugs are designed for hunting large game, self-defense, and other uses. The first effective modern shotgun slug was introduced by Wilhelm Brenneke in 1898, and his design remains in use today. Most shotgun slugs are designed to be fired through a cylinder bore or an improved cylinder choke, rifled choke tubes, or fully rifled bores. Slugs differ from round-ball lead projectiles in that they are stabilized in some manner.

Snake shot refers to handgun and rifle cartridges loaded with small lead shot. Snake shot is generally used for shooting snakes, rodents, birds, and other pests at very close range. The most common snake shot cartridge is .22 Long Rifle loaded with No. 12 shot. From a standard rifle these can produce effective patterns only to a distance of about 3 metres (10 ft), but in a smoothbore shotgun that can extend as far as 15 metres (50 ft).

An electroshock weapon is an incapacitating weapon. It delivers an electric shock aimed at temporarily disrupting muscle functions and/or inflicting pain without usually causing significant injury.