Balistic tests and penetration through denim

This is a discussion on Balistic tests and penetration through denim within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; When reviewing different ammo tests of SD hollow points it appears there is more penetration into the balistic gel when the bullet goes through denim ...

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Thread: Balistic tests and penetration through denim

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    New Member Array Tony87cle's Avatar
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    Balistic tests and penetration through denim

    When reviewing different ammo tests of SD hollow points it appears there is more penetration into the balistic gel when the bullet goes through denim than when it is bare. I would think the denim would cause less penetration. Could anyone please explain this? Thanks

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    The denim (or other heavy clothing) plugs the HP, thus minimizing expansion. Less expansion, more penetration. You still make a hole in the BG, just a bit deeper. Contrary to what many think, denim and goose down vest don't make one bulletproof, just two holes for the price of one.
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    Quote Originally Posted by Tony87cle View Post
    When reviewing different ammo tests of SD hollow points it appears there is more penetration into the balistic gel when the bullet goes through denim than when it is bare. I would think the denim would cause less penetration. Could anyone please explain this? Thanks
    If the denim clogs the hollow point, the bullet will function as something like a full metal jacketed bullet. FMJs tend to penetrate more than HPs (especially more than HPs that expand). So even with the extra energy needed to go through the denim, overall penetration can be greater.

    In a similar vein, greater velocity can lead to less penetration, if the additional velocity puts a hollow point bullet over the threshold to expand. So a .357 may actually penetrate less than a .38 with less velocity (and less energy).

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    New Member Array Tony87cle's Avatar
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    Thanks. That makes sense.

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