Could a 4.62" sneak in??
A pair of 24-3s.
One for show:
One for go (but the Lobo holster is pretty showy)
In my quest for a 3" mid-size steel framed revolver (mostly a K frame), I ran across this '78 Security-Six today and couldn't say no to the price. I'm still after that 3" K frame, but this will do yeoman's work until then.