The ammo stowage of ships makes 0 sense

For this post ill be using the USS Maryland for example.

For starters, the ammo in the turret is “100” in the xray, but as you can see there is 6 locations, each with 8 shells, thats 48.
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Secondly, even taking the bare minimum of 72 shells gives you all 760 charges in the ship. But furthermore, you will have the “400” (192) shells in the turret still.

Taking a number below 760 will give you all 760 shells and charges.

Also, apparently both of these equal “90” shells.
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This makes no sense at all.

Forgot to add but theres quite a few other ships like this.