I found a pretty cool bullet/wall penetration article written for what appears to be the city of Boulder CO.
It looks like they were looking into retrofitting some of the old gov buildings, as well as looking for inexpensive ways to bullet proof new construction.
The article: http://www.huts.com/Huts'sBallisticTest.htm
From another website, it seems that the sand filled walls would do just fine if they had made them just 2 inches thicker. (perhaps lined with a rubber sheet or innertube material that might promote self sealing and curb sand loss)
The article: http://www.theboxotruth.com/docs/bot7.htm

Thought this info might be of value to some.
It looks like they were looking into retrofitting some of the old gov buildings, as well as looking for inexpensive ways to bullet proof new construction.

The article: http://www.huts.com/Huts'sBallisticTest.htm
From another website, it seems that the sand filled walls would do just fine if they had made them just 2 inches thicker. (perhaps lined with a rubber sheet or innertube material that might promote self sealing and curb sand loss)
The article: http://www.theboxotruth.com/docs/bot7.htm

Thought this info might be of value to some.
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