STARLINE Bossoli 357 Sig (100pz)

357 SIG Brass (Small Pistol primer)
357 Sig-Sauer
0.856 - 0.862 O.A.L.

Basically a .40 S&W necked down to accept a .355" diameter bullet. Most pistols chambered for the .40 S&W can be converted to .357 Sig or complete firearms are available from Sig-Sauer. Cannot be formed out of .40 S&W.