Well, the Single Six was originally a six-shot .22, so to make it a .32 means less metal to contain pressure. The SP101 was originally designed as a .38 that could contain the wildest +P+ .38 loading, which approached .357 magnum pressures, and was of course eventually chambered in .357. However, the SP101 was originally 5-shot, which keeps the cylinder bolt notches well away from the chamber walls. The .32 SP101 is 6-shot, which means the cylinder bolt notches are closer to the chamber walls, meaning less metal to contain pressure. Just providing food for thought; not taking a position on which is stronger. I am perfectly happy with my .357 SP101 snubbies, which fire ammo way hotter than any sane .32 H&R, and are my everyday/always carry guns. I have no desire to hot-rod loads in my .32 H&R SP101. One more morsel of food for thought: Some talented gunsmiths have modified Single Sixes to accept the .38 Special and even the widlcat .41 Special, so it does seem the Single Six has some margin for experimentation in that particular direction, anyway.