I find that user control is the best method for long range gunnery. I've actually sunk a couple ships outside 10,000 yards. I don't think AI normally fires beyond 5000. In real life Tang fired on shore batteries off Truk as they were picking up downed aviators, from about 4000 yards. They were only really able to keep them ducking, as they were not able to clearly see the batteries. Read Clear the Bridge! by Richard O'Kane for the actual account.
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"Damn the torpedoes, full speed ahead!" -David Farragut (probably repeated by many WWII sub skippers)
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