Well, if it makes you feel any better I saved awhile back at a point where I encountered a Hunt destroyer. I then tried a couple of times just to plain surface and destroy it flat out with my deckgun. He always won, and I lost. Badly.
I was in an IXB too with the larger deckgun and using AP shells. Didn't really matter though, he'd always cream me before I could pump enough shells into him to slow him down.