Boy, the .45 Colt cartridge is one that you 'never' see laying around here
. Every .45 Colt shooter always keeps his brass. From box to gun, and gun to box! Now 9mm or .40 you see a lot of as people don't spend the time to retrieve their mess. .45 ACP gets picked up too... except for the small primer stuff that nobody can stand.
And as above .. you really do need a .45 Colt SA revolver