So, some years back I was helping a friend with feral hogsbon his property. My main preference was a little short Ruger Compact in. 308 which was light and handy for quick shots up in thick cover and also did well out to some distance in the open. My ammobwas usually factory Rem 150gr CL'S. It was very seldom I managed to find the cases in the long grass or underbrush.
I purchases a couple of MFRB's of once fired mil/surp and went to work on it. Yes most was fired through full auto or even any number of belt fed rotary weapons. It took quite a bit of sorting, sizing, and trimming, to get it to reliably feed in my rifle. There were a couple of different staps so it was all separated by brand but not year.
After that experience and even well before with all range pick up, I sorted by headstamp. Just found that the accuracy loads in a couple of rifles preferred certain brands. Then came my bottom feeder pistols, which up until the late 80s I had been shooting only revolvers. First it was the 10mm, which was mostly always new brass loaded because you just didn't find much if any once fired. Then came the 45acp which again I purchased a couple of boxes of and went to town. Quickly found target quality loads came from sorted headstamps. Then the 9mm's came to the stable. In a few months I managed to run 9K rounds through them shooting mainly target loaded cast, but with Berry, RMR and other brands if plated mixed in. I also found that there were a few brands that were not desirable and some had internal shoulders and such.
So yes, I still sort by headstamp, I trim my revolver cases if needed to .005 shorter than the max trim length or whatever the shortest case measured out of a handful is in a particular batch. Rifle cases same deal as the revolvers. I do have batches of new that I have used either from Starline, Win, Rem, or whoever had what I needed. I usually load it till it quits or splits and move on, kinda similar to my handgun cases. Work through a batch of say 500, and use em till I loose em.