For whatever nut case reason, early on I kept pistol brass in 50 round boxes and kept track of the number of times fired. I still have plenty of 357 Mag, 44 Special, 45 LC, 44 Magnum cases where I have the number of times the stuff has been reloaded. I gave that up for 38 Special brass and 45 ACP because I was firing an ammunition can or two every year and it was impossible to keep brass segregated by firings.
At one point, I had 44 Special brass that had about 20 to 25 firing's, I removed them from their 50 round boxes, added new to those boxes, and continued to fire the old stuff. Old loaded stuff is in a big ziplock bag in a 50 cal ammunition can, and when I fire it, the empties go into another ziplock bag in the same can. When the loaded stuff is all fired, I reload all the empties. I have no idea of how many times it has been reloaded now. I occasionally have a cracked case neck.
At the end of every Bullseye Pistol season I am loading 45ACP empties for next season. I fill up 30 caliber cans with reloaded 45 ACP and I have no idea how many times any of the cases have been fired and reloaded. I do not recommend filling a 50 caliber can with loose loaded 45ACP ammunition as a full 50 caliber can must weigh 50 pounds! I love GI ammunition cans, fill one up with loaded ammunition, shoot the loaded ammunition, and fill up another ammo can with the empties. At some point, I need to reload, and then I reload the whole lot. I do keep track of powder lot changes when an old jug of Bullseye Pistol powder is empty and I have to go to another but different powder lot. There are velocity differences between lots and that is important when shooting loads that just function a 1911. So what is left of the old lot is bagged, and the new powder is also bagged, to keep them separate.
This is one reason I standardized on pistol loads. It is much easier to load a whole ammunition can, or two, with one load that shoots well in all pistols. My standard 38 Special load is a 158 L with 3.5 grains Bullseye. It shoots well in everything. I found a 158 L shoots great in a 357 Magnum with 13.5 grs 2400 in a 357 case. It is just a bugger to have a 50 round box here, and another there, with different loads. Sure, when testing a new powder, I do run small batches, but once I like a load, I use it for ammunition cans full of loaded brass.
I love Lake City rifle brass. The case heads are stamped with a date and it was easy to keep track of the number of times one particular year was resized and reloaded. With full power rifle rounds, it is important to keep track of the number of firings, as primer pockets open in time. Tell you what, I scrounged hundreds of Federal Gold Medal 223 match from the Service Teams at Camp Perry, and the case heads on that stuff would expand from third to fifth reload, and the primers would fall out in the action, causing jams. It is important to keep that stuff segregated and to keep track just where I am on the number of firings.
Scrounged brass is free, and I don't feel bad about tossing it when it gets to be suspect.