I actually think PT boats should have some form of ASW. The US often replaced the aft tubes with racks of depth charges. I am attempting to find more detailed info, but I'm at a loss...
The best "use" I can describe is in the 1943 propaganda movie "Crash Dive." In the beginning, a PT boat sinks a "German U-Boat" (actually, an American sub was used for underwater shots) with 3 charges and no hydrophones. Then again, this WAS propaganda.
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Largest target sunk with deck gun: Japanese auxiliary cruiser, 15000 tons
Largest engaged: HMS Nelson. Results inconclusive.
Read Brag's stuff 
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