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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.223 vs 5.56 Chambers - HUGE bullet jump?
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<blockquote data-quote="Loner" data-source="post: 453549" data-attributes="member: 24560"><p>The 5.56 is throated longer to accomodate higher pressures it is loaded too. In theory</p><p>(and in actuality) a 5.56 can stretch the case enough to pinch the bullet in the case by </p><p>expanding into the throat of a .223 chamber.</p><p> There are several .223 reamers and several 5.56 reamers. Not only is the neck dia.</p><p>larger on some the freebore dia is larger, the throat angle less and the freebore longer</p><p>and throat becomes longer due to it's wider starting point and lesser angle to get back</p><p>down to bore dia. </p><p> In a nut shell, if you have a 5.56, you reload, and you have a fast twist like a 1:8 or</p><p>1:9 go with longer bullets in the 70 grain range and you can load out to the lands.</p></blockquote><p></p>
[QUOTE="Loner, post: 453549, member: 24560"] The 5.56 is throated longer to accomodate higher pressures it is loaded too. In theory (and in actuality) a 5.56 can stretch the case enough to pinch the bullet in the case by expanding into the throat of a .223 chamber. There are several .223 reamers and several 5.56 reamers. Not only is the neck dia. larger on some the freebore dia is larger, the throat angle less and the freebore longer and throat becomes longer due to it's wider starting point and lesser angle to get back down to bore dia. In a nut shell, if you have a 5.56, you reload, and you have a fast twist like a 1:8 or 1:9 go with longer bullets in the 70 grain range and you can load out to the lands. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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.223 vs 5.56 Chambers - HUGE bullet jump?
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