Here's what I don't get. Why the .357 sig at all? Why not just shoot the .40sw?
I'm a .40 fan & IMO it's one of the best all around calibers, but the .357sig does have a penetration advantage, especially when it comes to sheet metal and automotive glass. Right now the .40 & .357sig are two of the most popular LE calibers in use in the U.S. The TN Highway Patrol, for example, now uses .357sig exclusively in their service pistols.