When I sell brass it is all mixed head stamped cases. I had a guy call and wanted 2,000 pieces all the same head stamp, can't remember what head stamp. So I told him he is welcome to come over and sort through the cases and take what ever he needed. He came down on a Saturday afternoon with his wife in the car with him.after about fifteen minutes he decided to just weigh out his brass and go home.
He said he sorts his brass and weighs each case and then fills them up with water and weighs the water so each case has the same exact volume.
Way to much for me, I resize & reload mixed headstamps.
Even my rifle hunting rounds are mixed head stamped cases.
At 100 yards they are accurate enough for me. My Remington 788 in 243 Winchester loves 100 grain Hornady SST's with 40 grains of IMR 4831.
For sighting in I shoot from a table with a chair and I use a rifle cradle so it takes a lot of the human error out of the equasion.
Here is my target. Four targets on one piece of cardboard useing four different types of 100 grain bullets (mixed head stamped range brass)
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I deer hunt back in Upstate Hew York and most of my shots are around eighty yards or less. Occasionally I might get a two hundred yard shot.