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So, when we start talking about both the rounds. There is one notable thing. These rounds are interchangeable. The size of the .223 rounds is almost the same as the 5.56 mm rounds. The .223 Remington chambers consist of a shorter leade. This leade contributes to increased accuracy. It is because of the increased pressure and decreased velocity. You have to note that all the AR 15 build are not the same. Each one has its unique differences. Conduct a discussion with the gunsmith and acquire potential replacements. Gaining important insights on ammo is sure to help you
 

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So, when we start talking about both the rounds. There is one notable thing. These rounds are interchangeable. The size of the .223 rounds is almost the same as the 5.56 mm rounds. The .223 Remington chambers consist of a shorter leade. This leade contributes to increased accuracy. It is because of the increased pressure and decreased velocity. You have to note that all the AR 15 build are not the same. Each one has its unique differences. Conduct a discussion with the gunsmith and acquire potential replacements. Gaining important insights on ammo is sure to help you
5.56 case is thicker at the base. Able to handle more pressure. The .223 has a thinner case at the base. Pressures are lower. Externally the are identical. Internally is the diff. Wilson combat makes a 223 wylde.. barrel chamber, that will accept both cartridges and both pressures. That’s the difference.,, HAPPY SHOOTING.🏁🌵
 

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The size of the .223 rounds is almost the same as the 5.56 mm rounds
Penicillin is almost the same thing as Levaquin. Next time your doctor prescribed one, take the other instead.

This is a topic that grinds my gears. For some odd reason, there are guys roaming around the world who are obsessed with claiming that these two rounds are the same. They are not. I honestly don't understand what people stand to gain by claiming otherwise.

Yes, you can safely shoot commercial .223 in your .223 rifle or your 5.56 NATO rifle.

You should NOT load 5.56 NATO in your .223 firearm. It is unsafe and not recommended.

With all due respect, no sane person would insist on loading .30-06 into your .30-30 lever action. This is the same. Forget that the rounds look the same. They are not.

Be well.
 
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