I should say, after exhaustive searching, that there is quite a debate on the penetration of 5.56, and it seems to hinge on weight of the bullet- the idea being that normally because the projectile is so light, and the energy so high, the 5.56 will get busted up and spend most of its energy on whatever it hits first, become unstable as hell in flight, and either hit the ground or break up into very small fragments- though some sources say the 62 grain steel core will not reliably do this, and tends to stay intact and use the much greater than a pistol round energy that it has to go through quite a bit of stuff...... the fbi likes the 5.56, as their tests showed it was less likely to overpenetrate than most pistol rounds- No one should think, however, that any rifle, pistol, or buckshot round will not go through several rooms in your house, however.......
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Mood the more as our might lessens
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