tony3 Posted January 31 Report Share Posted January 31 I have a cz 223 would I be able to use 556 ammunition or would the pressure be too much for the barrel regards tony Quote Link to comment Share on other sites More sharing options...
Zoli 12 guage Posted January 31 Report Share Posted January 31 10 minutes ago, tony3 said: I have a cz 223 would I be able to use 556 ammunition or would the pressure be too much for the barrel regards tony no as the chamber (neck section) to accommodate the .223 Remington round is a different profile to a 5.56 NATO round. Quote Link to comment Share on other sites More sharing options...
Zoli 12 guage Posted January 31 Report Share Posted January 31 2 hours ago, Zoli 12 guage said: no as the chamber (neck section) to accommodate the .223 Remington round is a different profile to a 5.56 NATO round. conversely,you can shoot 7.62 x 51 in a .308 but not .308 in 7.62 chambered gun as the profiles are the same. this is because military brass is thicker so contains less powder than .308 giving different pressure values. Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted January 31 Report Share Posted January 31 I belive the 5.56 shoots a bit faster than a .223 also ? With higher presures . Quote Link to comment Share on other sites More sharing options...
Zoli 12 guage Posted January 31 Report Share Posted January 31 8 minutes ago, Ultrastu said: I belive the 5.56 shoots a bit faster than a .223 also ? With higher presures . depends on which bullet weight combination but generally .223 is faster. Quote Link to comment Share on other sites More sharing options...
impala59 Posted February 1 Report Share Posted February 1 Going back a few years, my old .223 Ruger M77 would group 1/2” at 100 metres with federal factory and 1 1/4” with my home loads which was fine for me. I was given some 5.56 mb which tumbled and keyholed the target at 25 metres. Needless to say I got rid of the 5.56 ammo! Quote Link to comment Share on other sites More sharing options...
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