I have a XD in 357 Sig, and I love it. The 357 Sig, is a 40 S&W necked down to 9mm(.357). It was designed to duplicate the old 357 mag loads. The Federal premium with 125gr slug makes 506 ft-lbs of muzzle energy. While the 40 S&W makes 424 ft-lbs with a 135gr slug.

Also, the rounds should not look the same. The .40 is straight walled, while the 357 sig is a bottle necked cartridge.

.40 S&W



.357 Sig