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Rifles, Reloading, Optics, Equipment
Reloading
.223 vs. 5.56
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<blockquote data-quote="nksmfamjp" data-source="post: 2799147" data-attributes="member: 1951"><p>Headspace is the same. There may be a tolerance difference, but commercial reamers are all being cut basically the same.</p><p>[URL unfurl="true"]http://ar15barrels.com/data/223-556.pdf[/URL]</p><p></p><p>The real differences are in the freebore length. This affects the way the pressure "loads up" on the back of the bullet as it enters the lands. Longer freebore can soften that spike.</p><p></p><p>It looks like pressure is different, but is it really? Psi methods vs copper crusher are just different.</p><p></p><p>This guy gets it right, it seems.</p><p>[URL unfurl="true"]https://www.luckygunner.com/labs/5-56-vs-223/[/URL]</p><p></p><p>One other thing to consider is 5.56 ammo is loaded to run in 1:7 twist barrels. These are typically 62-77gr bullets loaded a bit hot.</p><p></p><p>223 is typically 40-60 gr bullets for 12 twist barrels loaded to medium.</p></blockquote><p></p>
[QUOTE="nksmfamjp, post: 2799147, member: 1951"] Headspace is the same. There may be a tolerance difference, but commercial reamers are all being cut basically the same. [URL unfurl="true"]http://ar15barrels.com/data/223-556.pdf[/URL] The real differences are in the freebore length. This affects the way the pressure “loads up” on the back of the bullet as it enters the lands. Longer freebore can soften that spike. It looks like pressure is different, but is it really? Psi methods vs copper crusher are just different. This guy gets it right, it seems. [URL unfurl="true"]https://www.luckygunner.com/labs/5-56-vs-223/[/URL] One other thing to consider is 5.56 ammo is loaded to run in 1:7 twist barrels. These are typically 62-77gr bullets loaded a bit hot. 223 is typically 40-60 gr bullets for 12 twist barrels loaded to medium. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
.223 vs. 5.56
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