i like the idea. As for the tapered case problem, the new Taurus raging hornet is, i beleive a tapered case. Apparently critics were sceptical, citing the above mentioned .22 jet. Taurus claims that the setback problems have been fixed, making it, apparently, at least so far, one of the first successful tapered case revolvers.
That still does not address the short fatties like the Sig, but who knows?
Have a good evening.