I imagine that most people know that a 5" naval gun has a barrel with a 5" diameter. However, how many of you know what the second number means, as in 5" 54 caliber or 3" 70 caliber.
Well, the simple answer is that the caliber in a naval gun is the length of the gun as a multiple of the barrel diameter. So a 5" 54 caliber gun is 54x5" long, or 270" (22.5 feet). I hope some of you find this informational.
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