Thread: 5.56 vs .223
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Old December 1, 2012, 09:39 AM   #17
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Join Date: November 20, 2007
Location: South Western OK
Posts: 2,500
A popular SAAMI myth concerns brass thickness of military 5.56mm cartridge cases. SAAMI says military cases are thicker than commercial .223 cases. i've weighed thousands of cases since 1968: US 5.56mm military cases are not thicker.

Some Brit military cases are thicker than US military cases. The thickest cases of all are Lapua; one must be careful when reloading those.

Click on brass weights comparison:
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