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The Water Cooler
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<blockquote data-quote="OKC_Jim" data-source="post: 2045528" data-attributes="member: 13601"><p>Mike, I'm not sure I understand what you're asking so I apologize if the answer I give isn't to the question you asked. <img src="/images/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p><p></p><p>First we understand that both 223 and 5.56 are both the same caliber and that case demensions are the same (I don't think you can even buy dies for 5.56 because they are the same as .223).</p><p></p><p>Basically there is a jump for the bullet from the case to the rifling. Generally the bullet shouldn't be in touch with the rifling when it is in the case. The 5.56 barrel is cut with a longer jump to the rifling than a .223 barrel. 5.56 bullets can extend out of the case further by spec than with the .223. Basically, my understanding is that, even though the case measurments are the same, you are allowed a longer over-all-lenght with the 5.56. Thus, both rounds will fit in a 5.56 chamber with out being in contact with the rifling. While both rounds might also fit in a .223 chamber, there is a chance that the 5.56 round will be in contact with the rifling. This can be a bad thing.</p><p></p><p>Also note that since the jump to the rifling is longer when using a 223 round in a 5.56 chamber, even though the round will work fine, you may notice a slight affect on accuracy.</p><p></p><p>That is my understanding. Hopefully I said everything at least somewhat correctly. I know it took me a lot of reading on various fora to try to understand what people were talking about.</p><p></p><p>Jim</p></blockquote><p></p>
[QUOTE="OKC_Jim, post: 2045528, member: 13601"] Mike, I'm not sure I understand what you're asking so I apologize if the answer I give isn't to the question you asked. :) First we understand that both 223 and 5.56 are both the same caliber and that case demensions are the same (I don't think you can even buy dies for 5.56 because they are the same as .223). Basically there is a jump for the bullet from the case to the rifling. Generally the bullet shouldn't be in touch with the rifling when it is in the case. The 5.56 barrel is cut with a longer jump to the rifling than a .223 barrel. 5.56 bullets can extend out of the case further by spec than with the .223. Basically, my understanding is that, even though the case measurments are the same, you are allowed a longer over-all-lenght with the 5.56. Thus, both rounds will fit in a 5.56 chamber with out being in contact with the rifling. While both rounds might also fit in a .223 chamber, there is a chance that the 5.56 round will be in contact with the rifling. This can be a bad thing. Also note that since the jump to the rifling is longer when using a 223 round in a 5.56 chamber, even though the round will work fine, you may notice a slight affect on accuracy. That is my understanding. Hopefully I said everything at least somewhat correctly. I know it took me a lot of reading on various fora to try to understand what people were talking about. Jim [/QUOTE]
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