5.56 issue

[scfrogmansc]

So i just got a batch of 556 once fired brass and started to process it for reloading... I noticed that the rim diameter was only measuring at .355 not a normal .375 anyone know what may cause the problem? why is the rim diameter measuring so small? I am not even going to load this it may cause some FTE....

[ExtremeX]

Picture and or Headstamp?

[tiller]

Why aren't you resizing? If your buying fired brass this is a must?

[CEDaytonaRydr]

Why aren't you resizing? If your buying fired brass this is a must?

Ummm.....

How is re-sizing going to affect rim diameter?


To the OP: I really wouldn't worry about it. I don't know what's going on; it could be a problem with your instrumentation, or maybe you've measured where the extractor caught the brass, who knows? That being said, 2 hundredths of rim diameter isn't a whole lot to worry about.

[scfrogmansc]

I do resize everything... i am no noob when it comes to reloading. I just happen to measure the rim of the brass and found the problem never seen if before so i figured i would ask on here.

[ExtremeX]

It would be really nice to know who manufactured those cases... what's the headstamp?

[Germz]

Resize one, chamber it and if it extracts...whats your issue? I highly doubt .02" will matter to the extractor.

[scfrogmansc]

Resize one, chamber it and if it extracts...whats your issue? I highly doubt .02" will matter to the extractor.

Its not extracting r... out of 30 rounds i get a FTE every 5 or 6 rounds or so

[scfrogmansc]

It would be really nice to know who manufactured those cases... what's the headstamp?

WCC 09

[Dutch Henry]

Well, .020 is not a minor dimensional error. .376 is the standard head diameter as well as the case body diameter. A .355 diameter would certainly contribute to non extraction in some rifles.

You may need to go through and measure the entire lot and cull out the cases with the undersized rim diameter. Things like this do happen when manufacturers are busy cranking out billions of rounds to satisfy demand.

[ExtremeX]

Thanks, unfortunately I don’t have any brass with a WCC head stamp otherwise I would have checked my batch and measured it for you.

[scfrogmansc]

.020 I can feel it with my hands.... yeah its a huge difference... even slips right out of the shell holder....