But.....isn't the entire purpose of using 5.56 inside your house to not penetrate walls?
Test showing .223 vs. handgun rounds in drywall:
http://how-i-did-it.org/drywall/results.html
(I realize 5.56 is more powerful than .223 so here's a link showing you might actually want to put .223 in your home defense carbine
http://www.thetruthaboutguns.com/201...esting-take-1/
It's interesting to note that even in this test only one type of .223 did not penetrate fully.
So maybe run-of-the-mill 55 grain ball is the way to keep from shooting someone in the next room?
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