In all the US War Patrol Reports I've read, I don't recall any that listed the number of deck gun shells used. Most reports are very specific about how torpedoes were fired, the model, exploder, etc so you'd think they would mention a deck gun attack. Maybe I haven't stumbled onto the 'right' report where the deck gun was used.
At least one skipper didn't want a deck gun mounted for his reasons, maybe the gun would increase submerged drag? OTOH you can see small deck gun ammo hatches that were used by the loaders to pass ammo up to the loading crew up top. One related thing I read said there was a nine man loading crew for the gun but I don't recall where I read that.
Happy Hunting!
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" Bless those who serve beneath the deep,
Through lonely hours their vigil keep.
May peace their mission ever be,
Protect each one we ask of thee.
Bless those at home who wait and pray,
For their return by night and day."
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