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.
To Be Determined
* Starline Brass does not sell any loaded ammunition. What you are purchasing are brass cases only and will need to be loaded into ammunition in order to be fired from a firearm.
I loaded 1000 rounds, I made them a little hot ok my fault rounds work no miss feeds but because of the load up stretched out the primer pocket but the next time I will put in a little less ;) 1300 fpf I will have to cut them down to about 1200 fps
Ronald R Yates Rochester Hills, Michigan
January 09, 2016
No one makes better brass than Starline. If you reload.357 Sig, .40 S&W or 10 mm, the necks will eventually have to be trimmed. The Redding. GRX sizing die is a tool that will get it done. The longer you wait to trim the necks, the more chance of your rounds failing to chamber in your pistol. This is information reloaders need to know.
Rod Nakanishi San Francisco, California
October 07, 2014
John Woolever Evant, Texas
February 07, 2013
This is top notch brass never had any problems with it have used starline for over 10 year.The quality of this brass is second none.