I tested 14" and 8" guns against a dug-in Sturmgruppe company spanning a hundred meters.
The first 14" shell landed about 30m off target, thus 80m away from some units, and killed every man in the company. Not the first volley, the first shell.
The first 8" shell was about 10m off target (these missions were fired with TRPs). It wiped out all but about 8 men, and the second shell finished the job. And these guys were in foxholes.