The 357 sig Isn't a Necked Down .40 S&W Case

["DoubleAction"]

.....Regardless what you have read, or heard, The 357 sig case Isn't a Necked Down .40 S&W Case. The 357 sig case was designed with thicker case walls than a .40case, to handle the higher pressure cartridge than a 40.

en.allexperts.com/q/Guns-Firearms-Projectile-1501/f/357-sig.htm

www.gunsamerica.com/blog/7-things-know-357-sig-sort/

.....I posted this, on another forum : Feb 2008 - Although the 357 sig case resembles that of a necked down .40 case; The 357 sig case is actually constructed with thicker case walls than the .40 S&W.

www.firearmstalk.com/forums/f56/40-357-sig-3680/index2.html