Tight grouping only makes a salvo consistently wrong if the underlying information is wrong. Early radar supplied readings rather than automatically locking guns onto a target. Sailors still had to enter those readings into mechanical fire-control tables, produce a solution, fire, observe the fall of shot, and correct it. A battery that fires more frequent and larger salvos therefore gathers ranging information faster even when both ships possess radar.
Notable Point · 24:08-26:44
Why radar did not eliminate ranging salvos
Tight shell grouping is not enough if the range solution is wrong, and early radar still depended on human fire-control work.