![]() The 223’s 55,000 psi will not be attained and therefore velocity and performance are hurt. The cause of this is the lack of pressure built by a 223 Rem cartridge fired from a 5.56 NATO chamber. Due to the throat difference between the two chambers a 223 Rem cartridge may not work optimally in a 5.56 NATO chambered weapon. The reverse of this is firing a 223 Rem cartridge in a 5.56 NATO chambered rifle. This is NOT safe and will cause primers to back out, or worse, cause harm to the operator, the rifle, or both. This is 10,000 psi higher than the 223’s normal functioning pressure of 55,000 psi. Due to the longer throat that the NATO chamber employs this combination will cause a 223 chambered weapon to run at approximately 65,000 psi or more. The biggest problem with these differences is when firing a 5.56 NATO cartridge in a rifle chambered for 223 Rem. This allows approximately one more grain of powder to be loaded into a 5.56 NATO cartridge this is what gives it higher performance than its 223 Remington cousin. The second and most important difference between the two is the fact that a 5.56 NATO chamber has a. A 223 Remington is loaded to approximately 55,000 psi. The first difference is the higher pressure level of the 5.56 NATO cartridge which runs at approximately 58,000 psi. Differences between the two are small but can have a large impact on performance, safety and weapon function. ![]()
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