I own a bri....uh....SP101 and it's not in a class with the light weight J frames as a pocket gun, for sure. It's the smallest, lightest .357 I can comfortably shoot. BUT, at 27 ounces, it's about as easy to carry my 3" Taurus M66. I do like the round butt profile of the Hogue I put on the SP101, though, very nice.

It carries well IWB, but I pocket carry a lot and don't haul it around in a pocket. I have thunderwear which carries the SP101 comfortably.
A 17-19 ounce gun like my 85UL or the 642, I'll put .38s in it. Even with the J frame .357s, I'll shoot .38s in 'em. BUT, they ride in a pocket nicely, you forget they are there. The SP101 is heavy enough to be a total pain and, besides, the Hogue (necessary for me because ot the recoil with hot loads) doesn't conceal like a boot grip does, either. My SP101 rides in an ankle holster rather well, too. Can't say that about the SP101. Kinda like putting on ankle weights to work out.