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...
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Any idea that relies on murder for its survival in intrinsically weak.