because it has a 6" barrel and is chambered for 460 Rowland. A 4" barreled N frame 357 is also 9.5" long, and in 357 mag, 158 factory loads are typically less than 1300 fps, and almost never crack 1400 fps. . The auto has 900 ft lbs, the revolver only 600- 700 ft lbs. Were you aware of this? 
