Really like BLUE RIDGE BRASS!! I get all my 40 cal (soiled since I contain the means and can easily clean it myself) cases from Blue Ridge Brass! I get it via the 4,000 at any given time and have never had a 10mm case in the bunch, nor a 9mm wedged inside among the list of 40’s. They do a terrific work!The go-to option of shooters, Precision Delt