Why N3 gun performance cannot be predicted precisely

How quickly would an N3's 18-inch guns find the range on Bismarck, and what damage would they do?

There is not enough real performance data to answer precisely because the guns and ships were never completed and exercised.

Paper specifications cannot show how quickly an N3's guns would find the range on Bismarck. A completed ship would supply firing trials, exercises, and records of actual weapon behavior. Engagement geometry would add further uncertainty even with those results. Any precise answer without service data would substitute invention for evidence.