Many of us shoot at organized ranges. Whether the firing line is outdoor or indoor, there is usually brass laying around. I reccomend picking up every piece of brass you shoot and everything that you find on the firing line.
I pick up all the brass that I see, even if I don't reload that caliber or even have a gun in that caliber. A lot of brass I see on the firing line is berdan primed, stuff that can't be easily reloaded. The brass is still worth something in scrap value. 7.5 Swiss as well as 7.62x54R brass is rather heavy, so a relatively small number of shell casings can add up to a few pounds worth of brass.
The scrap yard I go to offers a dollar and thirty cents per pound of brass. Even if you save 22s, it can add up after a while. It costs nothing to keep it, aside from a small amount of space. Call me a cheapskate, but I've got a solid $20 worth of brass waiting for the scrap yard that didn't cost me a dime.