Really like BLUE RIDGE BRASS!! I get all my forty cal (filthy considering that I contain the sources and can certainly clean it myself) instances from Blue Ridge Brass! I get it because of the 4,000 at any given time and have never had a 10mm situation in the bunch, https://reloading-40-s-w64173.onesmablog.com/fascination-about-once-fired-40-cal-brass-79678410