Over the years there have been several tests done comparing the penetration of .223/5.56 against service handgun calibers in common building materials like wallboard. I think these discussions and tests started up when patrol carbines started to replace shotguns in police cruisers and were designed to show cops using those evil black rifles weren't going to kill little Timmy after the bullet passed through the bad guy and three houses. In those previous tests, the handgun service calibers tended to penetrate more walls and to stay truer to their trajectory than the .223/5.56. All of the tests I have seen (non-scientific) tend to use .223/5356 ammunition with FMJ, older SP designs, OTM, or varmint bullets. The FMJs tend to flatten and tumble, most of the others fragment and don't penetrate as far as the handgun bullets.
My question is, does barrier blind .223/5.56 ammunition change this calculus and to what degree?
Thanks.