What are the ranges implied by the A/B ruler?
From what I read the relevant range was 100-200 yards in which the Carronades had an advantage.
Regular guns had do be under charged at this range so as not to shoot through-and-through.

(This actually happens in modern warfare as well some "heavy missiles" might go through light ships and
explode on the other side. I even saw once a Mortar shell that was slowed but did not explode by the deck of
a patrol boat - the crew was not very happy sailing with an unexploded shel back home to get it removed by specialists