Yeah, I read about that a while ago. I think Modern Marvels on History Channel showed something about this too.
But other than that, the info is limited.
Quote:
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The RBCD bullets do not appear to be a true frangible design, as significant mass is retained after striking a target.”
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Googling around, it looks like truly frangible bullets are designed to disintegrate upon hitting harder objects, to prevent ricochet.