Maybe you should damage the vessel with an ordinary weapon at first, that the game mechanism counting your tonnage is triggered. Some shots with the gun or flak should be enough to damage the target and when it sinks, due to what ever happens to it, it should count. Try it and let us know. :-)
P.s. nevertheless ramming with an unarmored and fragile hull of a sub is very uncommon and should be avoided. BdU will not be happy with a damaged boat because of some tons of fish.
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