Ok - but that is ballistic gelatin penetration. The comment I replied to claimed both expansion and lack of penetration in drywall, neither of which is at all a realistic expectation for extant 5.56 rounds, to my knowledge.
Not trying to sound rude at all, but you should actually read the link...
Relevant excerpts:
"Tests 1-6: Bare gelatin, heavy clothing, automobile sheet metal, wallboard, plywood, and vehicle windshield safety glass, were shot a distance of 10 feet from the muzzle."
"Tests 7-13: All involved shots through heavy clothing, safety glass and bare gelatin at 50 to 100 yards, concluding with internal walls, external walls and body armor at 10 feet."
"The Bureau’s research also suggests that common household barriers such as wallboard, plywood, internal and external walls are also better attacked with pistol rounds, or larger caliber battle rifles, if the objective is to "dig out" or neutralize people employing such object as cover or concealment."
"If an operator misses the intended target, the .223 will generally have less wounding potential than some pistol rounds after passing through a wall or similar structure."
Really unsure as to how you could possibly have come to that conclusion after reading the link....
Edit: now that I think about it, people unfamiliar with ballistic testing might not know that gelatin is almost always used to find out data about efficacy downrange regardless of what other things are being tested, so I can kinda see how you might take my comment at face value and feel that it was immediately contradicted if you didn't read the entire summary (which is a bit long).
Ah, ok. I read the "Equipment Deployed" section which called out gelatin, body armor etc. but not walls and such. Ctrl-F'ed for "drywall" just to be sure and didn't hit since the term isn't in the document (though obviously they mention walls lots of times which I failed to notice).
I still say though, the original comment I replied to is mischaracterizing what happens when 5.56 hits drywall. It does not make a huge hole, and I don't know how you could say it "would not significantly harm" a person on the other side. See some tests here w/ photos regarding drywall and 5.56 penetration: https://www.theboxotruth.com/the-box-o-truth-14-rifles-shotg...
Pistol calibers very well may penetrate further after passing through drywall (as the FBI tests indicate) but there is no evidence to claim that 5.56 is less than lethal after passing through a sheet of drywall.
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
