I am not sure I am picky but for my 9 mms I have more brass than I know what to do with so for practice ammo I use only brass win brass and for self defense loads I use nickel win brass. I sold off thousands of pieces of other 9 mm brass and still have a few thousand I can't be bothered to deal with. I always have sorted brass by headstamps on everything, not picky just OCD. I am picky about my bench rest brass.
Tim