If held high on the grip, which I believe to be the correct way, the axis of the SP101’s bore is quite low, in relation to the axis of the forearm’s Radius bone. (The Radius bone is on the thumb side of the forearm. The Ulna bore is on the little finger’s side of the forearm.) So, the SP101, held high on the grip, produces relatively less muzzle flip than many other compact handguns.
Notably, when I first owned an SP101, in the early Nineties, to serve as a back-up for my GP100 duty handgun, I thought the SP101’s recoil was brutal, when fired with any Magnum ammo, but I do not think I was paying attention to holding high enough on the grip. I sold or traded that first SP101. When I subsequently realized that I had had not been handling the SP101 correctly, I bought another, in 1997, and still have it. This time ‘round, holding the weapon correctly, Magnum recoil was not so daunting. I added more SP101 five-guns, in more configurations, over the next decade, or so, and still have them.
Recoil affects different folks in different ways. In limited quantities, I have fired my SP101 snub-guns with full-pressure Federal and Remington 125-grain .357 ammo, and Federal Castcore 180-grain ammo. I have normally carried less-formidable ammo in my these smaller weapons. When it was plentiful, the 145-grain Winchester was a favorite. I have liked the Speer 135-grain Short Barrel .357 load, when I could find it.
I find it very comforting to know that the smallest revolver that I normally carry can be loaded with full-pressure .357 Mag ammo, the same as I have in my larger GP100 sixguns, or our .357 Mag lever-action rifles, and know that my hands can handle the resultant recoil.