I shoot low pressure smokless loads in damascus shotguns. Google SR 7625, that's the powder you need to use.

You could use the 20 gauge hull IF you trim it to the correct length.  Brass cases would be more appropriate. 

I would stay away from using smokeless powder in the 20 ga.  Pressures start going up and you could shoot the barrel/frame loose or worse yet, crack the frame at the junction of the fence and lower frame.

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See if these might not work for you;

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Your invitation presents an interesting challenge, but has little appeal for me. 

My friend and schuetzenmeister just acquired a 12 Bore English double rifle.  He manufactured a bullet mould and shortened brass cases to fit his chamber and invited me to shoot it.  That was an invitation that I readily accepted.

C.M.M.

I'm still waiting for adaptor rings to convert Mag Tech™ 20 gauge brass to use in my 1873 Model, so this is simply the result of research.  I would hesitate to use any smokeless loads of any sort in an original Maynard, not because of the barrel, but the action.  Look at the standing breech containing the firing pin... it is pinned and silver soldered (maybe) to an altered percussion action.  This was done over 100 years ago.  I really wouldn't want to trust my face, ugly though it is, behind a smokeless load in that receiver.  YMMV, but be informed what you are doing.

Froggie