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The FBI's "recommended 12 inches of penetration" is something that has set modern bullet design back 40 years!
First, this recommendation is for law enforcement officers who must put themselves in harm's way, not civillians who carry for defense.
Second, this "study" was a CYA study for the FBI after the Miami shootout. 12 " of penetration is not necessary at all. IF a couple of the rounds fired in that shootout penetrated 12", then the outcome MAY have been different.
The 12" figure comes from a hypothetical situation where a bullet entered an extended arm on a frontal shot. How do they know that an arm bone wouldn't deflect the bullet from it's course?
The Box of Truth is an interesting exercise in ammunition comparison, but all it will tell you is what bullet to use if you are attacked by water jugs.
The perpetuation of the "12 inch myth" by the B.O.T. and others is a disservice. The FBI study is but one small tool in the study of terminal ballistics, it's NOT the definitive one. Please try to understand it and take it in the proper context.
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