Lake City 5.56 brass is made from "harder" and not thicker brass. And as you can see below most .223 and 5.56 cases have simular case capacities. And as you can also see it is above average in quality and uniformity.
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I buy bulk once fired 5.56 and 7.62 Lake City brass because I'm a cheap bastard and the brass is better than Remington or Winchester and a fraction the cost of new brass.