The Dan Wesson 357 SuperMag was chambered for the 357 SuperMag through out its entire life.  Early ones were marked 357 SuperMag on one side of the barrel shroud and 357 Maximum on the other sided.  Then Maximum chambers just as a 38 Special will work in a 357 Magnum.  The SuperMag being longer is only a problem when trying to use it in a Ruger Maximum.  (I think the Ruger could digest the 50,000 pressure.)  Nominal chamber length in the Ruger is 1.610.  Thus a SuperMag case may be an interference fit.

As for brass,,the first box of empty Winchester Maximum brass I had measured 1.610.  I had some PMC brass head stamped "Gates" but it would stick badly in the chamber no matter how light the load.  I have good results with Star Line brass.

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Charger Fan said

unspellable said

Early ones were marked 357 SuperMag on one side of the barrel shroud and 357 Maximum on the other sided. 

  

I'd sure like to see one of those shrouds. Not saying it's impossible, but so far I have yet to see one that has "357 SuperMag" marked on it as opposed to just "SuperMag" that the rest of the Monson guns had. Monson guns, being the early ones, of course. 

  

You raise a question in my mind.  I have not seen a shroud marked 357 SuperMag myself, although I've ran across mention of it.

I do know the Dan Wesson and the Seville were specifically chambered for the SuperMag while the Ruger was chambered for the Maximum.  The DW has a spiffy main spring to deal with rifle primers. 

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