I don't own one. But I think a pistol chambered in .357 SIG would be a much above average fighting pistol. It pretty much duplicates the ballistics of the .357 Magnum in a short, fat, bottlenecked cartridge--so it has enough power and would be very flat shooting. Also, the bottle neck design would help insure that it fed reliably.

The slower propellants it uses would probably see it gain a substantial bit of velocity in 16" barreled carbines.

The Smith & Wesson FPC chambered in .357 SIG would be a good multi purpose carbine.

[Linked Image from i.postimg.cc]