RE: .308 once fired brass (and I don't reload)
My only question would be - how good was the Federal American Eagle brass.
With old age setting in - it is hard for me to remember much about that load, but I believe that some of my friends shot some in their machine guns a while back - because it was cheaper than the standard rounds.
You get into some different things when the price of the ammo goes down - such as crimped in primers, cases made of things other than brass and some brass that is not reloadable.
Most gun shops here will give you $2 a box for all the empties you can bring in.
They will sell brass for $4 a box for all you want.
You can pick though the empties and replace rounds that might have been stepped on at the range or damaged with rounds that are good.
I had several boxes of .308 Winchester that was National Match Grade - that I could have sold for $10 a box for the empty's - box included.