I believe you'd need to do a barrel, recoil spring and maybe a magazine change to do it. But as is the answer would be no, a .40 S&W round will not chamber in a bottleneck .357 Sig chamber
Somebody has to speak for these people. Y'all got on this boat for different reasons, but y'all come to the same place. So now I'm asking more of you than I have before. Maybe all. Sure as I know anything, I know thisthey will try again. Maybe on another world, maybe on this very ground swept clean. A year from now, ten? They'll swing back to the belief that they can make people...better. And I do not hold to that. So no more runnin'. I aim to misbehave. Mal Reynolds Serenity/Firefly
Extractor in a chambered 357sig will work on
9mm and 40. +1 on barrel needed, spring for 357sig will
Work on 40,45, and 357sig. 9mm needs lighter spring. Mag for .40 will hold both that and 357 or vise versa.