TexasCHLforum.com

If you're worried about over penetration for HD, as we all should be, then I would find some kind of frangible ammo.

You probably only need 50 rounds or so on hand cause you'll never shoot them unless the door gets kicked in. I always practice with the fmj and the business ammo lives in the mags and never gets fired.

Ammunition to Go usually has some on hand.
http://www.ammunitiontogo.com/

FMJ, JHP, Softpoints - all out of a .223 aren't going to stop until they hit something really, really hard and you won't find something that hard in the average home. I'm not much of a ballistics expert but I would have my doubts about a single wall completely stopping frangible but it's better than nothing.

A .223, if fired inside a home that doesn't at least have a brick exterior, more often than not is going to be visiting the neighbors house as well.
(edited cause I ca'nt spel good)