Like BLUE RIDGE BRASS!! I get all my 40 cal (filthy considering that I have the methods and can certainly clean it myself) cases from Blue Ridge Brass! I get it by the 4,000 at a time and have never had a 10mm scenario during the bunch, nor a 9mm https://40-s-w-once-fired-brass64850.thekatyblog.com/37005420/the-ultimate-guide-to-reloading-40-s-w-brass