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Originally Posted by Doc TH
"a 30 caliber bullet in a 5.56 case.."??
How do you get a .30 cal. bullet into a 5.56 mm (.223") case?
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Assuming he is referring to a .223 Remington/5.56x45 case, the case is necked down to accept the .223 projectile. The case itself is easily large enough to accept a .30 caliber bullet.
http://www.saami.org/PubResources/CC...0Remington.pdf
The case diameter near the head is .3759", and farther forward, but before the neck, it tapers to .3542".