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Dual cartridge die conversions vs single cartridge?

Greetings! After over 30 years with a 550B, I am returning to the SDB for my handgun ammo. I have a minor dilemma.

I have a 38 Special conversion kit (20102). How would this conversion kit differ from the 38 Special/357 Magnum combination conversion kit?

With conventional dies,I know that you have to make adjustments to allow for the neat 1/8" difference in case length. How do you compensate (if necessary) for the 38/357, 40/10mm, and 44 Special/Magnum dies? Do these combination die conversions require a degree of float for the Magnum cartridges?

 

As always, thanks in advance for your help!

Your 38 Special conversion kit will also load 357 magnum cartridges.  From 38 Spl to 357, you will back up stations 2,3 & 4 approximately 1/1/4 to 1 1/2 turns.  Both the seat and crimp die bodies will float within the frame.

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