I don't like to copy long previous posts, but as far as colt_ssa's most excellent post is concerned I do need to ask a few questions and opine a bit...

How hard is it to find 356TSW ammo and/or brass these days?

Ditto for the 9x23?

Why, if you can get both 9mm & a 40 S&W in a 1911 platform, did nobody ever come out with one in 357 SIG?

Seems to me to be an opportunity: and a 357 SIG revolver (along the lines of the Charter Arms Pitbull) would almost be a no-brainer!

Cheers!