Why American cruisers would not transform the firepower chart

How would Cleveland-, Baltimore-, and Atlanta-class cruisers compare on the Royal Navy firepower chart?

Not very differently: similar gun calibres faced similar loading limits, with rapid six-inch fire remaining difficult for eight- and 9.2-inch systems to match.

A viewer asks where the Cleveland, Baltimore, and Atlanta classes would sit on the British firepower chart. The result would not be radically different because comparable six-inch, eight-inch, and anti-aircraft weapons faced similar physical limits. British development pushed a six-inch loading cycle down to about six seconds by the end of the war, though roughly seven and a half seconds is given as a more usual figure. Eight-inch weapons could not match that cycle, while a proposed 9.2-inch gun would load more like an eight-inch weapon than a six-inch one. The comparison emphasizes the mechanics of calibre and handling rather than treating national origin alone as decisive.