You can not find historcal sources for the ammo ammounts of the deckgub because it has no storage in real , hey had carried about 200 shells, i think that also depends on which mission the boat was. The shells where stored in the main storage of the ship but its ok to have it outside for me but the limit of 270kg is quite not a lot that could be extended

Thanks for sharking that info! I got that 20 minute reload time by asking some sub enthusiasts, rather than going though such reports, thanks again for letting us know!

War Beneath the Seas by Peter Padfield stated that Günther Prien loosed a full salvo at Royal Oak with one being a tube runner. He fired a stern tube and reloaded the 3 bow tubes still operational in just about 30 minutes. So he fired 7 eels total with three of them being reloads between opening fire at 00:55 and concluding at 01:28 which would make the torpedo reload time sub-15 minutes since one stern shot was also taken. Ace of aces like Günther Prien might be the exception rather than the rule however seeing as that breed of skipper were compulsive and meticulous about training the crew that might not be representative of the average u-boat. I find it all fascinating though so if you found a hard number somewhere for the average time I would genuinely love reading it. I can't get enough of all the little technical details like that!

Couldn't find a report of the exact weight capacity, but for the ammo ammounts, they are based on real life

wow, this is wath we need
all real capacity ?