Originally Posted by fredIII
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Denton is correct, it is a myth that 5.56 cases are heavier and have less case capacity then civilian 223 brass.

This is from Sierra.

The conventional wisdom to reduce loads with military brass is familiar to most reloaders and is generally good advice. The rationale here is that the military cases tend to be somewhat thicker and heavier than their civilian counterparts, which in turn reduces capacity and raises pressures. This additional pressure normally requires a one or two grain reduction from the loads shown in most manuals or other data developed with commercial cases. While this is most often the situation with both 308 Winchester and 30-06 cases, it is less true with the 223 brass. We have found that military cases often have significantly more capacity than several brands of commercial brass. Again, take the time to do a side-by-side comparison of the cases you are working with and adjust your load as needed. There may be no need for such a reduction with the 223. Know your components and keep them segregated accordingly.

http://www.exteriorballistics.com/reloadbasics/gasgunreload.cfm

There is also this, scroll down to Case Weight vs Capacity

http://www.6mmbr.com/223rem.html

And this.

[Linked Image]

Here is my current stash of 223/5.56 brass.

GFL(223) dry weight-102.4gr
With H20-131.4
Case capacity in grains of H20-29gr

Remington(223) Dry weight-95.2gr
With H20-125.1gr
Case capacity in grains of H20-29.9gr

LC(5.56) Dry weight-96.3gr
With H20-126.7gr
Case capacity in grains of H20-30.4gr.



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