What if British officials had calculated the range to the German First Scouting Group correctly at Jutland?
Short answerMore British shells would have fallen in the correct area, probably sinking Seydlitz and perhaps additional German battlecruisers that barely survived historically.
NotesSome British ships obtained better ranges than others during the battlecruiser action. If the whole force had used correct range data, a much larger share of its shells would have landed near the German line. That does not guarantee individual hits, but it increases their mathematical probability and the damage inflicted. Seydlitz barely reached home after the historical battle. Additional hits could plausibly have sunk her and one or more companions in the First Scouting Group.