81 mm artillery typically refers to a type of medium mortar that fires 81 mm caliber shells. This caliber is commonly used by various armed forces around the world for infantry support and indirect fire support. Mortars like the 81 mm can be towed or mounted on vehicles and are designed to fire shells at relatively high angles, allowing them to hit targets that are not directly in line of sight. The 81 mm mortar is favored for its balance of range, accuracy, and portability.

80 mm artillery typically refers to a type of artillery piece that fires projectiles with a caliber of 80 millimeters. This caliber often pertains to mortars, as 80 mm is a common size for medium mortars used by various militaries around the world. These mortars are designed for indirect fire, allowing them to launch shells at high angles to hit targets that are not in the direct line of sight.

The term "800 mm artillery" typically refers to a type of large-caliber artillery piece that has a bore diameter of 800 millimeters. The most notable example of an 800 mm artillery piece is the **Schwerer Gustav**, a heavy railway gun developed by Nazi Germany during World War II. It was designed for the purpose of penetrating heavily fortified positions, such as the French Maginot Line or the Soviet Union's defenses.

77 mm artillery refers to a type of artillery piece with a caliber of 77 millimeters. This caliber was used in various artillery systems throughout the 20th century, particularly during World War II and the post-war period. One notable example of a 77 mm artillery piece is the Soviet 77 mm field gun M1936 (also known as the 76.2 mm gun F-22), which was used by the Soviet Union during the war.

76 mm artillery generally refers to a caliber of artillery that uses projectiles with a diameter of 76 millimeters. This size has been utilized in various types of artillery pieces, including field guns and naval guns, and was particularly prominent during the 20th century. One of the most famous 76 mm artillery systems is the 76 mm OTO Melara gun, which is widely used in naval applications and has been mounted on a variety of ships.

75 mm artillery refers to a type of artillery weapon that uses a 75 mm caliber projectile. This caliber has been used in various artillery pieces, including howitzers, field guns, and anti-tank guns, throughout military history. The term "75 mm" indicates the diameter of the shell fired from the cannon. Historically, 75 mm artillery has been significant in multiple conflicts, especially during World War I and World War II.

The term "630 mm artillery" typically refers to a type of large-caliber artillery piece designed to fire projectiles at a significant distance. The specific designation "630 mm" indicates the caliber of the artillery, meaning the diameter of the barrel and thus the diameter of the shells fired.

The term "600 mm artillery" typically refers to a type of heavy artillery with a caliber of 600 millimeters (mm). One of the most notable examples of this caliber is the **German "Dora" railway gun** used during World War II. The Dora was a massive piece of artillery designed for long-range bombardment, capable of firing heavy shells over great distances.

The term "560 mm artillery" typically refers to a category of very large caliber artillery pieces, specifically those with a barrel diameter of 560 millimeters. This size of artillery is rarely used in conventional military operations and is generally reserved for specific applications such as siege artillery or coastal defense. One notable example of 560 mm artillery is the Japanese "Type 5 560 mm howitzer," which was developed during World War II.

The term "520 mm artillery" typically refers to large-caliber artillery pieces that have a bore diameter of 520 millimeters. This caliber is notably larger than standard artillery used in most conventional military applications. An example of a 520 mm artillery piece is the Soviet "K欲" (also known as "Katushka" or "K-3," which is a railway gun).

The term "460 mm artillery" typically refers to large-caliber artillery pieces that have a bore diameter of 460 millimeters. One of the most notable examples of 460 mm artillery is the Japanese Type 94 460 mm Howitzer, which was used during World War II. This was a heavy siege gun designed for long-range bombardment and capable of firing large explosive shells.

450 mm artillery refers to large-caliber artillery pieces that have a bore diameter of 450 millimeters. These types of artillery are usually classified as heavy artillery and can include howitzers, mortars, or siege guns designed for long-range firepower. The large caliber allows them to fire heavy shells capable of creating substantial destruction upon impact.

The term "420 mm artillery" typically refers to large-caliber artillery pieces that fire projectiles with a diameter of 420 millimeters (approximately 16.5 inches). This caliber is notably associated with heavy artillery systems that are designed for long-range bombardment and can cause significant destruction. One of the most well-known examples of a 420 mm artillery piece is the German "Dora" and "Großdeutschland" railway guns used during World War II.

The term "413 mm artillery" generally refers to artillery pieces or gun systems with a caliber of 413 millimeters. One notable example is the **Schwerer Gustav**, a German super-heavy railway gun used during World War II. The Schwerer Gustav was one of the heaviest artillery pieces ever constructed, designed to be able to fire massive shells capable of penetrating fortified targets, such as the heavily defended French Maginot Line.

400 mm artillery refers to heavy artillery pieces that have a caliber of 400 millimeters (mm), which is approximately 15.75 inches. This type of artillery is typically used for long-range bombardment and can deliver a significant explosive payload over great distances. The use of 400 mm artillery is primarily associated with large siege guns, coastal defense weapons, or heavy artillery systems designed to provide support against fortified positions or to engage enemy forces at long ranges.

380 mm artillery refers to large caliber artillery pieces that have a bore diameter of 380 millimeters, which is approximately 15 inches. Such artillery is typically used for heavy bombardment and can be designed as howitzers, mortars, or naval guns. The size indicates that these weapons are capable of firing relatively large shells over significant distances, which allows for both destructive power against fortifications and effectiveness against enemy troop formations.

The term "356 mm artillery" typically refers to large-caliber artillery pieces that have a bore diameter of 356 millimeters. Throughout military history, artillery of this caliber has been used for various purposes, including siege warfare and coastal defense. One prominent example of 356 mm artillery is the **356 mm naval gun** mounted on certain battleships or coastal defense systems. These guns are capable of firing heavy shells over long distances, making them effective against both land and naval targets.

The term "350 mm artillery" typically refers to large-caliber artillery pieces designed to fire projectiles with a diameter of 350 millimeters (mm). Such artillery systems can include howitzers, mortars, or coastal defense guns. These types of artillery are typically used for heavy bombardment in military operations and can cause significant destruction due to the large size of the shells they fire.

340 mm artillery typically refers to large-caliber artillery pieces that have a bore diameter of 340 millimeters (approximately 13.4 inches). These types of artillery are most often associated with heavy howitzers or coastal defense guns and are used for long-range bombardment, siege warfare, or fortification support. One notable example of 340 mm artillery is the **"340 mm howitzer Model 1939,"** which was used by the Soviet Union during World War II.

The term "330 mm artillery" typically refers to large-caliber artillery pieces that fire projectiles with a 330 mm diameter. Such large-caliber artillery systems can be used in various military applications, including siege warfare, long-range bombardment, and indirect fire support. One notable example of 330 mm artillery is the **BM-30 Smerch**, a multiple rocket launcher system developed in the Soviet Union.