I don't know if this is proper gun porn, though I thought I would throw it out there.
I took a section of 0.75" thick mild carbon steel (often used for industrial structural support) to the range with me today. I wanted to see if the issue M855 green tip would live up to the hype of being able to penetrate steel up to 0.25" @ 100 meters and 0.125" @ 600 meters when fired from a standard length M16A2.
From a 14.5" barrel @ roughly 30 meters, I the three shots averaged 0.5166" of penetration, with an entry hole diameter average of 0.6501".
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Calmer than you are...
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