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.

Starline prides itself on being the choice of top handgun shooters across all disciplines, with a production process focused on quality not quantity. Starline is a family owned business and prides itself on producing the highest quality brass case available. With a production process focused on quality not quantity, Starline makes the finest brass and has for more than 40 years out of their state-of-the-art manufacturing facility in Sedalia, MO.

Packaged in 100 count bags.