I had the same exact thing happen over a year ago with Starline 300 BLK brass. The brass split in the middle just like yours. Some of the brass had little slits on the shoulder also. After I called them, I sent STARLINE a picture and the brass back to them and they sent me a bunch of new brass. They were and are very responsible for there products.you mean like this? They know of a bad lot from a while ago. This was from that lot. They replaces them. All you have to do it call them.
![]()
I learned my lesson with starline 223 brass a while back.Hearing rumblings about a bad batch of starline 5.56 brass recently