I take it then I really shouldn't attempt to develop my new concept Ultimate Ultra Mega round, the
.577 Special! 
...come to think of it, under NFA regs one can't make a handgun chambered in anything over a 0.5050", so maybe I'm best off working on a rifle of some form for this Minie ball dispensing wristbreaker/shoulder-dislocator.
But getting back to the subject at hand--
TMR is looking forward to someone out there making a RIFLE that is chambered in the .500 S&W. A rolling block would be cool, maybe a Martini-Henry / Peabody-Martini lever actioned single shot........
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