5.56 vs 223 ?

[choppers]

Can someone educate me on 5.56 nato vs 223 remington? I have read were they say don't shoot 5.56 in a 223 chamber because 5.56 has more presure and will damage the gun, but then i have been told that it is the same cartridge. Please help!!

 

[redneckmedic]

While the external case dimensions are very similar, the .223 Remington and 5.56x45mm differ in both maximum pressure and chamber shape. The maximum and mean pressures for some varieties of the 5.56 mm (different cartridge designations have different standards) exceed the SAAMI maximums for the .223 Remington, and the methods for measuring pressures differ between NATO and SAAMI. The 5.56 mm chamber specification has also changed over time since its adoption, as the current military loading (NATO SS-109 or US M855) uses longer, heavier bullets than the original loading did. This has resulted in a lengthening of the throat in the 5.56 mm chamber. Thus, while .223 Remington ammunition can be safely fired in a 5.56 mm chambered gun, firing 5.56 mm ammunition in a .223 Remington chamber may produce pressures in excess of even the 5.56 mm specifications due to the shorter throat.

 

[infidel]

https://www.indianagunowners.com/forums/ammunition_and_reloading/71354-5_56_vs_223_question.html


IBTL

 

[Bastispah]

and to think i thought they were the same. Wow, thanks for the info!

 

[jlm223]

This may help check it out. 223 Rem + 223 AI Cartridge Guide

 

[Mr. Habib]

Here are the differences in chamber dimensions. http://www.ar15barrels.com/data/223vs556.pdf

 

[hc4sar]

TRY www.6mmbr.com click on .223 or 5.56mm good read plus a few loads

 

[tenring]

The Gun Zone -- SAAMI on 5.56 v. .223 Remington