Took quite a while for a reply! J-frames do their best work with the 158gr lead bullet "service load." A standard pressure round, it is good to go in your guns. And since many "jobs" practiced and qualified with wadcutter target loads, these rounds will also do well in the lightweight snubs of that era. They are rather expensive at the present time, so the LRNs may be a better bet. Can't go wrong with either. Hope this helps.
Kaaskop49
Shield #5103