The Maxo: I agree with your measuremts and remind you that Seville 357 Maximums had a slightly longer cylinder than the DWs. That is why the cast bullet I use in both my Rugers and DWs, the excellent Lyman #358627 (215 grain SWC with gas check) has 2 crimp grooves - the top for Ruger and the bottom for the other revolvers. And, when loading for a TC, Handi Rifle, Savage 24, or any other single shot you can use 35 cal spire point rifle bullets that won't fit in any of the revolvers. Still, everything is a 357 Maximum. According to IHMSA there has never been any commercially produced brass with a head stamp "357 SuperMag" even though DW calls their guns that. All brass has been called Maximum which leads me to believe that the correct name of the round regardless of minor differences in brass length and bullet lenght and design is 357 Maximum.