That's mental! I'd never have guessed at that arrangement.
The 3"/50 is called that because it's a way of describing the barrel length relative to the shell they fire. The second number multiplied by the shell size is the length of the barrel, so a 3"/50 is 3" x 50 = 150" long and a 4"/50 if 200" long and a 5"/25 is 125" long. You can see at a glance the relative lengths.
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