I purchased a 550b on here last week and it came setup with a couple dillon die sets. I have redding 3 die sets in .40(sizing/expander/seat-crimp) and .223(neck/full/seat) that I would like to use with it also. The .40 dies have the combo seat/crimp die which I have heard it's better to do separately. Is it worth it to buy a taper crimp die? Or just eliminate one station and use the combo die? For the .223 I'm guessing I need to get a roll crimp die since it will be used in an AR. Any suggestions on what I should use? A couple places said the Lee factory crimp dies worked pretty good. I have to place an order through dillon soon so I could get their crimp dies if they are better.