.
In my other life (the one in the Ideal World), I have plenty of time and money, and a huge reloading/gun room, with a dedicated computer to spreadsheet out my loads, and track things down to the brass case lots (in fact, I laser-engrave serial numbers on each case and track it through the reloads I subject it to).
Of course I use a different set of cases for each firearm, so for guns I have several of, like 357 Magnums, I have a separate lot of cases for each gun, only using them in THAT particular gun, reload after reload.
I have numerous 'optimized' loads for each firearm, using cheap 'practice' bullets, but also data (even if the bullet weight is the same and the overall construction is the same - i.e. JHP and FMJ with similar gilding metal jackets - because the thickness and resistance of the jacket could still differ) for 'hunting' or 'protection' bullets.
This takes me 10 hours or so per week to manage and pour over, looking for ways to improve things, and that's on top of the 10 hours a week spent actually reloading. Add another 10 hours per week actually at the shooting bench, collecting accuracy and chronograph data, and it is a lot of time......especially since doing this is so expensive that I have to work 70 hours a week to support my hobby.
Alas, that's a hundred hours per week, and one does have to sleep, so that's another 60 hours per week. There are 168 hours in a week though, so if I bathe and eat quickly, I can usually squeeze in a half-hour or so to actually hunt or shoot with my buddies...
The SCARY part is that I actually DO have enough OCD (aggrivated by adult-ADD no doubt) that that really WOULD be my 'Ideal World'...
Thankfully, the Real World wins, so I usually manage to scrounge up enough brass cases that are of the proper cartridge, get some kind of primers that fit the hole, throw in a bunch of powder that's within spec, cap it off with a projectile of some sort, and manage so far to not blow up any guns...
