Some discussion this morning on my ammo add led me to find this information. This is as good as it gets to show us the good vs the bad between these two types of ammunition. These guys ran more ammo through their AR's than the overwhelming majority of us will run in our lifetime.

http://www.luckygunner.com/labs/brass-vs-steel-cased-ammo/
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You can boil them antlers all day long boy and you still can't eat 'em