I had a hellish time getting to grips with crimping. My loads were (and still are) .38Spl and .44Mag, so almost the same as yours.
Personally, I too have gone for a seperate crimp die.
I can't imagine the different grades of stress-induced insanity/profanity I'd have inflicted on my wife (She would have heard me all the way from my garage at the end of the road!) had I needed to get the crimp and OAL just right with the same die!!
For the cost of that single die, I'd say get it...
You cannot wake someone who is pretending to sleep. Stop pretending. Wake up.
Doubt: ...it's the only thing I'm sure of...
-Marsupials: Nature's idea of Concealed-Carry-