I guess I don't really see my 60-15 as a "j-frame", even though it is. With Pach Compacs on it, it has some weight to it, like a mini-686. I see it as a great, all-around carry revolver.
If I'm plinking with it, it's .38s. Out for a hike or enjoying nature some way, it's .357, 158 gr JSP. Carrying around town, 125 gr Golden Sabers (.357).
Looking at the physics of it, the 135 gr SB load by Speer appears to be a hot 9mm, which isn't to shabby, either.
It's not fun to touch off full-powered magnums, but it's nice to have the option, and the beefier grips make all the difference to me.