I've never used a .357 SIG in any pistol, but I've talked to a couple local dealers who reported the same jamming issues in various makes and models. That was enough to convince me not to bother buying one. I swear by SIGs, and the P239 is a great carry pistol. But I'm a .40 S&W guy 100%, and I definitely wouldn't trust the .357 SIG when I need it most.

I tried finding some engineering specs online, but to no avail. If SIG won't give you the information you're looking for, try finding a licensed SIG armorer.