Good for your son! The first round DA with the 19 was a bit rough, but the next one looked good.
A 2 1/2" 19-3 is comfortable to shoot with midrange .38 Special ammo. Sounds like you hit a good combination. What was the grouping like?
Here is the 19-3 snub that I shoot fairly often:
Your 10-5 looks to be in very nice condition.