Howdy Again
While the smaller Top Break revolvers were often limited to cartridges the size of a 32 or 38 S&W, larger Top Breaks could accommodate larger, and longer cartridges.
The S&W Double Action 44 that I have pictured was available with a slightly longer cylinder chambered for 44-40. So was the New Model Number Three. A very few were also chambered for 38-40. While neither of these revolvers were ever chambered for 32-20, the cylinders were long enough that they could have been.