I couldn't see a third gen like the Shiranui weighing more than 30-40 tons dry. And if you go by most modern aircraft carrying about 60% of their dry weight again in ordnance they may very well tip sixty tons in a full combat load.
Then again like modern aircraft they aren't always going to deploy with the heaviest load out depending on their position within the flight.
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"It doesn't mean much, we never had a chance."
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