JPH,
I hear what you're saying and would agree with it, if it wasn't for the fact that my .357 Handi shoots .38 Specials pretty well. It will chamber and shoot .360 DW's, so you know the chamber is long, but I don't get any better groups with the .360's than I do with .357's. Sure, I'm shooting some 250 gr Beartooth LFNGC's that are pretty long (they won't fit in a revolver), but I also shoot 180 gr XTP's very well in .360 and .357 seated to the cannelure on both.
Very well to me is close to 1"-1 1/2" at 100 yards.