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Message: <blockquote data-quote="Drebin" data-source="post: 2006689" data-attributes="member: 25880">Here is an excellent article on the differences of .223 and 5.56.<a href="http://www.luckygunner.com/labs/5-56-vs-223/#more-115" target="_blank">http://www.luckygunner.com/labs/5-56-vs-223/#more-115</a> I have shot over 1500 rounds of steel case through my AR and 800 through my old SKS with no issues. Steel case allows me to get in more target practice so I like to shoot it sometimes but I still shoot brass most of the time because thats what I store in my ammo cans. I'm not sure why it would wear out extractors faster than brass cased ammo, does anyone have any evidence of this?</blockquote>