The list is in no particular order. And it doesn't list lot numbers for the civilian ammo. I really like winchester brass for my 308, and one could say that the 223 brass sample size was a tad small to draw firm conclusions from. But that aside, it is enough to demonstrate that there is no significant weight differences (and by inference) no significant volume differences between milsurp 5.56 and civilian 223 brass.
I wouldn't draw any quality conclusions from the list.
Machine guns are awesome until you have to carry one.