Hopefully this will at least get you to look for modern, home defense rounds and then come to your old conclusions about 5.56 and dry wall... I'm not trying to prove you wrong here, just trying to get you to do some research about modern 5.56/.223 and really just modern ballistic advancement in general.
"The hypothesis turned out to be correct: V-Max bullets started fragmenting within the first sheet of drywall and completely blew to pieces on their way out of the second sheet, leaving dramatic craters." http://how-i-did-it.org/drywall/results.html
"The hypothesis turned out to be correct: V-Max bullets started fragmenting within the first sheet of drywall and completely blew to pieces on their way out of the second sheet, leaving dramatic craters." http://how-i-did-it.org/drywall/results.html