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They are 16 inches in diameter and the barrel is 800 inches long (16 × 50 = 800). This is also sometimes indicated using the prefix L/; so for example, the most common gun for the Panzer V tank is described as a "75 mm L/70," meaning a barrel with an internal bore of 75 mm (3.0 in), and 5,250 mm (17 ft 3 in) long.
The 155 GH 52 APU (which stands for 155 mm gun-howitzer, 52 calibers, auxiliary power unit), Finnish designation 155 K 98 (155 mm kenttäkanuuna 1998 or "155 mm field gun 1998"; FDF terminology does not recognise gun-howitzers), is a Finnish towed artillery piece developed in 1998.
The 56–52, the most common of the new calibers, used a 50-cal bullet. Other black powder-era cartridges used naming schemes that appeared similar, but measured entirely different characteristics; 45-70, 44-40, and 32-20 were designated by bullet diameter to hundredths of an inch and standard black powder charge in grains.
Unlike later cartridge designations, in the Spencer .56-56 the first number referred to the diameter of the case just ahead of the rim, while the second number is the case diameter at the mouth; the actual bullet diameter was .52 in (13 mm). Cartridges were loaded with 45 grains (2.9 g) of black powder, and were also available as .56-52, .56-50 ...
The Model 1874 Sharps (this model had been in production since 1871) was a particularly popular rifle that led to the introduction of several derivatives in quick succession. It handled a large number of .40 to .50 caliber cartridges in a variety of loadings and barrel lengths.
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5"/51 caliber guns (spoken "five-inch-fifty-one-caliber") initially served as the secondary battery of United States Navy battleships built from 1907 through the 1920s, also serving on other vessels. United States naval gun terminology indicates the gun fired a projectile 5-inch (127 mm) in diameter, and the barrel was 51 calibers long.