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Winchester small rifle | winchester small rifle primers for 5.56mm
The actual case capacity will vary depending on a variety of factors related to 5.56 and 223. So, to summarize: the external dimensions of 223 Remington and 5.56 NATO ammunition are nearly identical.. A 1% difference in case capacity between the 223 Remington and the 5.56 NATO is all that separates them.
If you’re trying to decipher the differences between 5.56 NATO and 223 Remington ammunition, the published maximum allowed pressure for each cartridge tends to cause a lot of uncertainty. The following is an example of data that may be published:
…and this data would make it appear that 5.56 NATO ammunition is certified “to a higher pressure” than 223 Remington ammunition. That is actually not the case! It’s only when we observe the US Military’s updated pressure testing and rating data when we see a parallel:
The conclusion is that the maximum working pressure of 223 Remington and 5.56 NATO is nearly identical. Is there a problem with the “interoperability” of 223 Remington and 5.56 NATO, then? In some cases, this is true. To begin, let’s compare and contrast the chambers of. 5.56 NATO and 223 Remington.
Many pieces of information are readily available online; others must be tracked down through the use of reliable sources and industry experts (large companies, smaller reamer grinding shops, and everything in between). Here, I’d like to point out that the chamber dimensions provided by reamer manufacturers and firearms OEMs appear to be somewhat “open to interpretation”. These are the numbers that I think best represent the differences between the 223 Remington spec chambers and the 5.56 NATO military spec chambers.
Reamers and chambers will differ, but the most important factor is how firearms are certified and tested. The chamber dimensions of the 223 Remington and 5.56 NATO are shown in the video.
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