The range does not make that much money selling the brass. In fact, it probably doesn't even cover the labor of sweeping the stuff up. Also, separating steel cases from brass is easy. Most ranges do not object to steel or aluminum cases. The story I've heard is that: 1) it tears up the concrete floor and 2) it can cause a fire inside of the backstop. The one indoor range I go to permits bi-metal pistol ammo, just not bi-metal rifle ammo.
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