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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Will 223 work in a 5.56 chamber?
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<blockquote data-quote="venatic" data-source="post: 655066" data-attributes="member: 33745"><p>I do agree that chambers vary but that would apply to all guns and calibers. If this were so critical you would see data for 5.56 AND .223 but you don't. </p><p>Here is some of the reason for the confusion. They test differently thus two sets of pressure data.</p><p></p><p>Wikipedia:</p><p></p><p>While there is a myth that 5.56 NATO cases are thicker and hence have less capacity than commercial .223 cases, this has been shown to be false. Each brand of case and each manufacturing lot has a slightly different case capacity; 5.56 NATO and .223 commercial cases tend to have nearly identical case capacity when measured using the water test.[6] The NATO specification allows a higher chamber pressure. NATO EPVAT test barrels made for 5.56mm NATO measure chamber pressure at the case mouth, as opposed to the location used by the United States civil standards organization SAAMI. The piezoelectric sensors or transducers NATO and SAAMI use to conduct the actual pressure measurements also differ. This difference in measurement method accounts for upwards of 137.9 megapascals (20,000 psi) difference in pressure measurements. This means the NATO EPVAT maximum service pressure of 430 megapascals (62,000 psi) for 5.56mm NATO, is reduced by SAAMI to 379.21 megapascals (55,000 psi) for .223 Remington.[7] In contrast to SAAMI, the other main civil standards organization C.I.P. defines the maximum service and proof test pressures of the .223 Remington cartridge equal to the 5.56mm NATO.</p><p>__________</p></blockquote><p></p>
[QUOTE="venatic, post: 655066, member: 33745"] I do agree that chambers vary but that would apply to all guns and calibers. If this were so critical you would see data for 5.56 AND .223 but you don't. Here is some of the reason for the confusion. They test differently thus two sets of pressure data. Wikipedia: While there is a myth that 5.56 NATO cases are thicker and hence have less capacity than commercial .223 cases, this has been shown to be false. Each brand of case and each manufacturing lot has a slightly different case capacity; 5.56 NATO and .223 commercial cases tend to have nearly identical case capacity when measured using the water test.[6] The NATO specification allows a higher chamber pressure. NATO EPVAT test barrels made for 5.56mm NATO measure chamber pressure at the case mouth, as opposed to the location used by the United States civil standards organization SAAMI. The piezoelectric sensors or transducers NATO and SAAMI use to conduct the actual pressure measurements also differ. This difference in measurement method accounts for upwards of 137.9 megapascals (20,000 psi) difference in pressure measurements. This means the NATO EPVAT maximum service pressure of 430 megapascals (62,000 psi) for 5.56mm NATO, is reduced by SAAMI to 379.21 megapascals (55,000 psi) for .223 Remington.[7] In contrast to SAAMI, the other main civil standards organization C.I.P. defines the maximum service and proof test pressures of the .223 Remington cartridge equal to the 5.56mm NATO. __________ [/QUOTE]
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AR15/10 Rifles
Will 223 work in a 5.56 chamber?
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