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The 3-inch gun M1917 was a World War I-era US-made anti-aircraft gun based on the 3-inch gun M1903. It was designed for a fixed mounting and remained in service, primarily at Coast Artillery installations, through World War II .
In the 1950s it could hold 6 x M20 ammo cans (3 per horizontal cardboard carton with spacers) or 3 x M21 ammo cans (3 per vertical cardboard carton with spacers). The former stored small arms ammunition in cartons or bandoleers while the latter was usually used to hold linked caliber .50 and 20 mm ammo.
First, its 3-inch bore was narrower than the 12-pounder's bore and could fire fewer canister balls. Second, the rifling of the barrel caused the canister to be thrown in an irregular pattern. For these reasons, Union General Henry Jackson Hunt believed that the 3-inch ordnance rifle's effective canister range was less than half that of the 12 ...
3.8-inch Gun, Models of 1904 and 1907 Similar to the 3-inch gun, but scaled up with a significantly longer barrel - 111.25 inches (2.826 m) overall gun body length instead of 87.8 inches (2.23 m) - in a larger caliber, with a lengthened recoil - 58.5 inches (1.49 m) instead of 45 inches (1.1 m) - as well as with a different extractor.
The 3-inch anti-aircraft gun M3 was an American anti-aircraft gun which served throughout the 1930s and into early World War II. [2] Developed from the earlier 3-inch M1917 and 3-inch M1918 guns, it was in the process of being replaced by the time of the US entry into World War II, but was subsequently adapted into an anti-tank gun role, both free-standing (as the 3-inch M5) and in a self ...
A round shot (also called solid shot or simply ball) is a solid spherical projectile without explosive charge, launched from a gun. Its diameter is slightly less than the bore of the barrel from which it is shot. A round shot fired from a large-caliber gun is also called a cannonball.