It may seem counterintuitive but .223 tends to fragment which reduces penetration of hard objects.
From http://www.rifleshootermag.com/featu...es/ar_patrol/:
It is a surprise to many people that the round that works best for going through walls is the 9mm. With relatively higher velocities, the .223 bullets generally break up upon impact, even when hitting a thin sheet of drywall. The resulting small fragments quickly lose their energy. Bullet selection plays a part in this, but even the toughest FMJ bullet tends to virtually disintegrate when it hits wood or drywall at 3,200 fps.
From http://www.steyraug.net/223forcqb.htm:
The FBI study clearly demonstrates the following: (1) that .223 rounds on average, penetrate less human tissue at dose range than the hollow point pistol rounds evaluated, (2) concern for over-penetration of the .223 round, at close range, has been greatly exaggerated, (3) with the exception of soft ballistic garment penetration. the .223 round appears to be relatively safer for employment in CQB events than this hollow point pistol bullets tested.
One other note: electronic hearing protectors would be a good thing regardless of firearm used.
From http://www.rifleshootermag.com/featu...es/ar_patrol/:
It is a surprise to many people that the round that works best for going through walls is the 9mm. With relatively higher velocities, the .223 bullets generally break up upon impact, even when hitting a thin sheet of drywall. The resulting small fragments quickly lose their energy. Bullet selection plays a part in this, but even the toughest FMJ bullet tends to virtually disintegrate when it hits wood or drywall at 3,200 fps.
From http://www.steyraug.net/223forcqb.htm:
The FBI study clearly demonstrates the following: (1) that .223 rounds on average, penetrate less human tissue at dose range than the hollow point pistol rounds evaluated, (2) concern for over-penetration of the .223 round, at close range, has been greatly exaggerated, (3) with the exception of soft ballistic garment penetration. the .223 round appears to be relatively safer for employment in CQB events than this hollow point pistol bullets tested.
One other note: electronic hearing protectors would be a good thing regardless of firearm used.


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