223 vs 5.56

[jerrymrc]

Not gonna mater what you say or what references you quote . The OP is the guy that wanted to build an AR10 in 6.5/284 and couldn't comprehend how the powders associated with that cartridge would affect the port pressures and timing with the gas system even though this is a well documented issue with gas guns going all the way back to the Garand . Physics must be suspended in Carbondale .

As one that has intimate knowledge with the FAL I understand. Years ago it was noted that with a correct gas setting switching from Port/Aussie/Hurt to SA required closing the gas setting 1-1/2. The Crono said that they were close but the results......

Have seen many builds that had issues with pulling the rim on brass to excess. Timing issues that can be corrected. My last build needed .050 trimmed from the gas piston to stop the pulling of the rim.It all happens in Milliseconds. And I am staying out of the .223/5.56 debate.

[20X11]

Here is a good answer to the OPs question...
http://cdn2.cheaperthandirt.com/blog...Iss11+Campaign