Are you shooting SASS? Because I make do with 100 357 cases and 100 44 Mag cases for casual plinking.
When I load my SASS rounds, I start with 45 Colt. Then 45 S&W Schofield, 44-40, 44 Special, and 44 Russian. They all use the same shell plate on my Dillon 450/550. After that 45 ACP then 38/357.
I've been playing with 300 Blackout, 30 Carbine and 357 Sig, so I've changed shell plates in the last year than in the previous decade!
When I started SASS shooting, I already had over 500 45 Colt brass. I won several hundred as door prizes, bought a few thousand new and every used case I could find! I ended up with about 5500. I had 1400 in 44-40, but sold the guns and ammo to another shooter. I bought 1000 44 Russian Top Brass from Midway, the first firing about 1/3 split, another 300 split on the second firing. At this point I had a few hundred Starline, and no problems with them. I have about 200 Top Brass yet to be fired the third time, soon I'll have no mor junk Top Brass left!
45 Colt and 45 ACP and 38/357 are the only hand gun brasses that I have over 5000 each of. (223 being the only rifle [20,000]) I really like to load a cartridge once a year, but when two sons and a son-in-law were shooting with me, we were going through close to 4000 rounds in a 4-day weekend with all the practice, and side matches and main 3-day event! I did have enough 45 Colt still loaded to just squeeze by, and only because one son shoots 38's!
Since Covid hit, I never see bags of used brass cheap. Everyone thinks they are made of 24 Karet gold, and price it as such!
Ivan