When German warships met the R-class threat

How close did German warships come to the guns of the R-class battleships?

They came into relevant proximity at Jutland and during several Second World War convoy operations, then sought to disengage.

R-class battleships fought at Jutland, so German ships did come under their guns during the First World War. Convoy protection also brought R-class ships near German warships in the Second World War. German raiders sought to disengage rather than exchange fire with their 15-inch guns. An escorting battleship therefore posed a substantial threat to a surface raider approaching a convoy.