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But the military 223 s tumble and even break in two pieces which do lots of damage.
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All FMJ rifle rounds do exactly the same thing when entering a soft target. They try to assume a base-first position, since that's where the bullet's center of gravity lies. It doesn't matter whether you discuss .223, .308, or .45-70...given enough medium in which to flip base-first, they'll all do exactly one 180-degree rotation.
.223 has a tendency to fragment at the cannelure, and other light and fast loads like to break apart as well, but no rifle round "tumbles" in the target other than precisely one 180-degree flip from tip-first to base-first.