Do whatever works for you. I've been known to by a 5 gal bucket of unsorted,unprocessed brass for 5.56. We then sorted them.The bulk was IIRC,
LC,FC,and either WW or WC. I don't recall exactly.Some of the off brand stuff was fine. Some problematic . We culled and scrapped the problematic brass.
The rest was processed with pins and lemonshine,and the pockets swaged.
Those days brass was scarce and expensive...like toilet paper. Upshot is,it started mixed,but sorted to be batches f LC or whatever.
Did it gain us anything? No testing,no data. Can't say.
I started reloading to re-use factory load and scrounged brass.(Like a lot of us)
The factory loads were what wason the shelf. Rem one day,Win the next.
For myself,the mishmash of brass made it hard to keep track.
I figured out buying factory ammo 40 or 60 rounds at a time was not efficient. for me. My old Weavers required a certain amount of chasing he grouparound the target to sight in.
My reloads and factory loads typically shot to a slightly different POI.
At some point,I commited to shooting handloads. 22 LR aside,most of my guns have had few,if any,factory loads fired through them.
The once fired 5.56 and 9mm aside,with a gun purchase I typically buy a lot of new,vrgin brass,from 200 to 500 or even 1000.
I usually manage two groups of brass. Your needs may vary, but I like at least a good range session in each group. One I'm shooting out of,the other is getting loaded and put on the shelf.Suppose I bought 500 or 1000. I might use two groups of 100. Single stage,its about right to load 100,for me.
That brass starts splitting necks,or whatever,I cull it.The whole bunch.Then I pull a new batch out of my inventory of the same lot of brass.
Generally,between 500 and 1000 brass is enough to wear out a barrel.
One of my goals handloading is to minimize variation.I just don't have time for the clutter and confusion of range pickup,etc
It all gets the same "experience" I'm always shooting the same ammo.
Record keeping is easier.
It works for me
Do I gain accuracy? Without a serious,side by side test,I can't claim it . I assume reducing variables helps.
Even if there snno accuracy gain,I'd do it my way for the reduction in chaos.
But,Natty,there is nothing wrong with what you are doing. If your ammo meets your needs,and its safe, shoot and enjoy.