Brass hulls save until you get a bunch up and sell. Steel hulls throw out. They can't be reloaded. You wont get a bunch out of your brass hulls but, it'll help offset the cost of what you're buying.
Picking up hulls in the woods is good ethics on the part of thhe hunter/shooter. Always had the thought of trying to leave a place in better condition than how I found it.
Do you just save the brass part and sale it as scrap metal and throw away the plastic shell or keep the all thing together?
I pick them up anytime I find spent shells left behind by hunters.
They must pick most of them up since I dont find that many, they just probably forget a few.
I found a 12 gauge spent shell on the beach once ... for someone reasons.
I use them for .22lr plinking targets.
Now that winchester changed the design from a one piece compression molded hull to a multi piece design, they are not as good as they once were. People who shoot trap and skeet do still reload them. The Remington one piece hulls such as the STS or Nitro 27's sell pretty good at about $40/1000, with the Remington Gun Clubs and Federal Gold Medal hulls in less demand getting about $30/1000. Most of the six piont crimp, discount line hulls have very little value.
Whatever you do, do not leave them lay, at least throw them away where they will not become litter.
If you want a lot of empty shotgun shells or brass stop by the Marion County Fish and Game.
We have a lot of members who will not pick up there shotgun shells or brass.
When asked, I was told "Because we pay dues someone else can pick them up" Just plain lazyness.
Some even leave there spent targets on the range.