Nice little 638! Thank you for the picture.
Now .... a little secret that you might not have explored.
All the plainclothescops in the ‘50’s, with their Model 36’s, Model 40’s, and Model 48’s, carried plain simple wadcutter loads. Not those turned around ones, just standard factory wadcutter loads. Lighter recoil, quicker second shot recovery, no 50/50 on a JHP ‘failing as advertised’ or not.
I carry standard wadcutters for the first load, with standard non-HP semi-wadcutters in the speed strips.
One more secret for you. If you remember the ‘Civil Defense’ authorities, they issued SandW Model 15’s, and the loads were full wadcutters.
I wish you well.