Courtesy of the great HSH, 24 rounds it is :
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From the test ship 892 :
So, a goalkeeper at the fore, a RAM at the aft?
pretty much.
Why can't there be TWO goalkeepers and one RAM? Why? Why??? OK, not that I care too much or anything.
As for the RAM system in the back. Didn't the USN did something similar with the AB but had to go back to the CIWS later ?