I have had a few and now using one that's made up of mixed # 55 Parts.  Guy gave me an older measure with a broken handle. Had a better looking body and the cast iron frame was brass bushed for the rotor. Newer one was not bushed however the rotors and handles  interchanged.  Far as I know all 55 internals are the same. 

Never do anything special to use Black Powder except it needs to be cleaned good after or the brass slider will corrode.  Some say the plastic hopper is a threat but I don't worry about it. If it's a concern plastic one is easy to replace with Brass or Aluminum tubing.   

Boats

   Thanks Boats and JCH, that's helpful.

It wasn't so many years ago that all of the black powder that I bought came in metal cans with screw on tops, Goex, Wano, C & H, Swiss and yes, some Elephant now and again when I couldn't find the others.  There was a myth circulating that you never put black powder in plastic, the concern being static electricity.

Now that I know the iron body in the #55 for B.P. is sleeved with brass for the rotor to rotate in, I'm thinking that the smokeless rotor is brass turning in an iron body.  Doesn't that arrangement (the smokeless version) preclude sparking ?  My thought is that it will, but I may be wrong.

In the very old Lyman handbooks the #55 is advertised for Smokeless and black.

Creedmoormatch

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That's my assessment exactly !  But I didn't want to say that and start a controversy or be indited with a second laughable offense.

I can tell that you've been around the block a few times, just as I have.  Thanks for your response.

Creedmoormatch