I posted the same question about the Williams Shooters Supply .45 Colts a few weeks ago so if your question is stupid, count among the stupid. Here's what members offered.
Black Hawks have been made with two cylinder frame sizes, mid-frame and large frame. .41 and .44 magnums have only been made in large frames. .44 specials have only been made in mid-frames. .357s and .45 Colts have been made in both sizes. Among old model center fires all mid-frames were .357, all .357s were mid-frame, and all larger calibers went in the large frame. Mid-frames were discontinued along with old models so originally New Model .357s were large frame. Mid-frames were reintroduced as Flat Tops then utilized as New Model Vaqueros. However, even in those models .41 and .44 magnums require large frames. The question of which frame size a BH is most often is asked about .45 Colts. Generally adjustable sighted .45 Colt large frames have the standard sight and adjustable sighted .45 Colt mid-frames are Flat Tops with Micro sights. The most reliable way to distinguish mid and large frames is mid-frames have 3 digit serial number prefixes and large frames have two digit prefixes.
Counting the small rimfire/.32 center fire Single Six frame there are still only three cylinder frame sizes. Grip frame shapes are another story.
