Frangible ammo is used to breach doors and frangible .223 Remington WILL PENETRATE SHEET ROCK.
I think that JHP .223 Remington will penetrate less than JHP pistol ammo. From what I've personally experimented with FMJ .223/5.56 will outpenetrate JHP through some mediums - including sheet rock.
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"Necessity is the plea of every infringement of human freedom. It is the argument of tyrants, it is the creed of slaves." ~ William Pitt, 1783
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