TexasCHLforum.com

I know this is a little bit outside the box but why not find a "pocket" gun along the lines you want chambered in .40S&W. Once you have it in hand you can get a custom barrel maker to set you up with a custom barrel for the .357 Sig. With .40S&W gun and .357 Sig barrel in hand you simply swap barrels and have a .357 Sig. This will leave you with a .357sig version of what ever gun you choose, so put a few hundred rounds through it to ensure it works properly and you should be good to go.