I'm kind of new to a 357 too, I just took it out and put some rounds through it a couple of days ago. I just shot a collection of 38s and 357s that I had laying around. I didn't try anything that was real impressive, but I was getting maybe 2" groups at 50. What did kind of excite me is that the gun was putting almost everything 357s 38s, lead and jacketed bullets, factory and handloads into pretty much the same group. And what seemed nicer is that as I shot longer ranges, the hotter stuff like the 357s were still hitting pretty close to the point of aim.
I haven't done any load development yet but I feel pretty confident that I should be able to make some loads that shoot.