[mapt]

My impression from what I'd read is that nearly anything that's got enough impact energy to penetrate clothing, soft flesh (denim & ballistic gel) and the hard bits of thorax, is going to get through perpendicular drywall very easily.

Here's the lightest round in common use, 22LR, holing 8 layers of drywall sequentially. This is 1/12th as much muzzle energy as .223:

https://www.youtube.com/watch?v=3ME3IEYoQXc

Here's pricy specialty frangible rounds designed not to go through walls... still going through walls in a test:

http://www.thetruthaboutguns.com/2014/09/daniel-zimmerman/sh...

[hatsunearu]

>Here's the lightest round in common use, 22LR, holing 8 layers of drywall sequentially. This is 1/12th as much muzzle energy as .223:

22LR doesn't tumble.

>Here's pricy specialty frangible rounds designed not to go through walls... still going through walls in a test:

Frangible rounds are usually used so it doesn't ricochet and hurt someone. It just becomes dust when it hits something hard that would normally bounce a bullet.

[mapt]

https://www.youtube.com/watch?v=X0qgQoej5zE

Here's a 223 round going through 10 layers of drywall, a pine 2x4, and six inches of ballistic gelatin afterwards. While tumbling, I'm sure.