Fired in a SAAMI spec .223 pressure barrel, 5.56 NATO loads have shown pressures in the 85K PSI range. That's bordering on a proof load. The good news is that most .223's made these days are not cut to SAAMI spec.Originally Posted by snowgetter1You can't make the assertion that mil brass is thicker than commercial. It varies by manufacturer completely unrelated to mil or commercial. That is why you sort by headstamp and work up loads separately for each different one.The only difference I have seen is the thicker Military brass leads to higher pressures quicker when reloading max. loads.
http://www.accurateshooter.com/cartridge-guides/223rem/ Check out the case data about halfway down the page.
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