I do not recommend this sort of brass for serious reloading. The problem is that you have no clue as to what you'd be getting and the probability is that there's a huge mix of brands, case wall thicknesses, case capacities, etc. This would make it nearly impossible to get good uniform results even if the loads created with it were on the "light" side. For any ammo that's loaded to emulate self-defense ammo, this mix of brass would be a show-stopper in my book because you'd have a potentially significant difference in chamber pressures from one round to another.
My suggestion - buy only new brass. Catch YOUR brass with a net while you're shooting and keep it in lots that have all been loaded a known number of times.
My suggestion for new pistol brass is
Starline Brass. There is no better pistol brass and their prices are quite reasonable.