Another eleven more-recent 74s were razeed in 1826-1845, in this case being fully reduced to 50-gun heavy frigates; three others were scheduled for similar conversion, but this was never completed. In the French navy, a number of 74-gun two-deckers were similarly razeed into 54-gun ships:   In the United States Navy, several of the final generation of sailing frigates launched in the 1840s were cut down to become large sloops-of-war. Advances in metallurgy and artillery in the 1850s allowed the casting of guns that fired substantially heavier shot than had previously been in use, as well as exploding shells. Thus, when the decision was made to rearm these frigates with heavier but fewer guns, the reduction in crew size allowed the ships to be razeed. Their sail plan and size made them superb sailers. Although these ships carried a heavier broadside as 20 gun sloops-of-war than they did as 40 gun frigates, they were rerated as nominally smaller sloops-of-war because they mounted fewer guns. Such ships include USS "Macedonian" and USS "Cumberland".