When I am reloading 9mm, 40S&W and 45ACP i don't bother to sort my brass by manufactorer. After I clean it I go through the brass and if there isn't any splits or those pesky primer rings I use them. I normally load a grain below max so I don't worry about the pressure. As for accuracy well my cz75B, glock 23 and smith4506 though accurate they aren't exactly target guns. I often finds piles of pistol brass from other shooters and one man's trash is another 's treasure. Evan with revolvers , though much easier to keep track of I'll mix them up if I'm shooting cast lead at moderate velocities. If I'm shooting XTP HPs at max loads then I'll make sure the brass is uniform. If someone was new to reloading what advice would you give? CD