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Rifles, Reloading, Optics, Equipment
Reloading
.223/5.56 brass
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<blockquote data-quote="Trickymissfit" data-source="post: 925344" data-attributes="member: 25383"><p>.223/5.56 brass is identical except for the primer crimp. But with exception here! Military brass (ala Lake City) is often manufactured with thicker case walls, but still identical externally. </p><p> </p><p>There are differences other than the numbers:</p><p> </p><p>* 5.56 on paper looks identical as I said, but the SAMMI spec lists it at about 10% hotter. The .223 is maxed at 55,000psi, and the 5.56 is maxed at either 60,000 or 61,000psi. Black Hill loads most of what we call Lake City, and they load it to about 58,000psi. In a modern bolt action rifle, you'll never know the difference. Yet in an AR15 chambered in .223 you might well know the difference. </p><p> </p><p>* The 5.56 chamber is what the real difference is between the two of them (.223/5.56). With the 5.56, the throat is cut a little differently. The throat angle is cut a little narrower, and maybe a tad shorter. Add this in with the higher chamber pressure spec, and you get the warning label</p><p> </p><p>* now it's advisable to down load military brass to a starting load; if not slightly less yet. Simply because the case volume is a little less.</p><p> </p><p>Most of us on this board are shooting bolt action rifles that are well made. They'll easily hold up to 5.56 pressure specs when shot in a .223. We're looking at rifle built to a 75K psi spec! Then you factor in the case head diameter of .378, and that's nothing like the .470" or .532" ones.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 925344, member: 25383"] .223/5.56 brass is identical except for the primer crimp. But with exception here! Military brass (ala Lake City) is often manufactured with thicker case walls, but still identical externally. There are differences other than the numbers: * 5.56 on paper looks identical as I said, but the SAMMI spec lists it at about 10% hotter. The .223 is maxed at 55,000psi, and the 5.56 is maxed at either 60,000 or 61,000psi. Black Hill loads most of what we call Lake City, and they load it to about 58,000psi. In a modern bolt action rifle, you'll never know the difference. Yet in an AR15 chambered in .223 you might well know the difference. * The 5.56 chamber is what the real difference is between the two of them (.223/5.56). With the 5.56, the throat is cut a little differently. The throat angle is cut a little narrower, and maybe a tad shorter. Add this in with the higher chamber pressure spec, and you get the warning label * now it's advisable to down load military brass to a starting load; if not slightly less yet. Simply because the case volume is a little less. Most of us on this board are shooting bolt action rifles that are well made. They'll easily hold up to 5.56 pressure specs when shot in a .223. We're looking at rifle built to a 75K psi spec! Then you factor in the case head diameter of .378, and that's nothing like the .470" or .532" ones. gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
.223/5.56 brass
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