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Originally Posted by Egan
(well, maybe a bit surprised. 12 rounds seems very high,)
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That actually sounds about right for most 4-5" guns. The official rate of fire for the 12pdr (3") from the 1890s was 20 rounds per minute.
On the other hand, we've had several years of discussions now concerning rates of fire in actual combat, and the average as observed over many actions at sea - for submarines of course - seems to be about 3 rounds per minute. High calm-water rates are offset by the fact that submarines have a very low freeboard, very high moment rates and can become quite wet in even a minor sea.