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<blockquote data-quote="Norske" data-source="post: 41780" data-attributes="member: 409"><p>The case neck is also thicker. This is for reliable functioning in full-auto military guns. If you have a generous chamber throat that was cut with a new reamer, you'd be alright with light (short) bullets. But if the reamer had been resharpened a few times, making a smaller chamber/throat, it will raise pressures a lot. The increased pressure might not be a problem in a bolt action rifle, but it was hard on 223 AR's. Your 223/5.56 has a Wilde chamber which is a kind of hybrid of the looser military 5.56 chamber/throat and the tighter civilian 223 chamber/throat. Military chamber throats are also longer for the heavier bullets now used. </p><p>See what a chamber cast of your rifle shows about the suitability of military brass. Gunsmiths do this, and it's not expensive.</p></blockquote><p></p>
[QUOTE="Norske, post: 41780, member: 409"] The case neck is also thicker. This is for reliable functioning in full-auto military guns. If you have a generous chamber throat that was cut with a new reamer, you'd be alright with light (short) bullets. But if the reamer had been resharpened a few times, making a smaller chamber/throat, it will raise pressures a lot. The increased pressure might not be a problem in a bolt action rifle, but it was hard on 223 AR's. Your 223/5.56 has a Wilde chamber which is a kind of hybrid of the looser military 5.56 chamber/throat and the tighter civilian 223 chamber/throat. Military chamber throats are also longer for the heavier bullets now used. See what a chamber cast of your rifle shows about the suitability of military brass. Gunsmiths do this, and it's not expensive. [/QUOTE]
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