I've been a "brass scrounger" for a long time, and things I pick up and can't use go to those that can. Good philosophy.I've used 284 Winchester for 7.5x55 Swiss, before reloadable brass was readily available. Now days the 284 brass is worth more than 7.5 brass.
If you need 450 Bushmaster brass, let me know. I have some that I've accumulated, and I don't use that caliber.