I'm not sure which mods have wound up touching the same things here, so maybe something else has changed the basic NSM, but I have not had any problem sinking a couple of freighters with my 4"/50 deck gun on this latest patrol (running RFB 1.31 swdw update, then NSM classic, then ROW (with zones for NSM classic), then RSRD for RFB1.31). The 6,000 tonner took about 80-100 shots, and the 1,800 tonner took about 40-60, but both eventually sank fairly quickly (I kept firing till they sank - it's quite possible that they would have sunk with fewer hits if I'd wanted to stick around and wait to see, but they were both daylight encounters and I didn't want to risk waiting around and getting surprised by some aircraft or escorts wandering by.
I have seen this sort of lingering death occasionally before, with decks awash seemingly forever, and it seemed to me a little odd that it would take that long for a ship to sink once it reached that point. Maybe it would be good if something could be tweaked further to speed things up a bit once a sort of "tipping point" was reached, but I don't think that it's the deck gun shells that are the problem at this point, at least in my current setup.
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