I am a collector of antique ammunition and have been for nearly 50 years, so I do have some knowledge. These are desireable and pricey rounds of ammo. Not because of their metal piercing abilities, which is limited, but because they are uncommon. A full box is a bonus. PLEASE DONT SHOOT THESE. Sell them to a collector. Next they are not cop killers or armour piercing. They are simply metal piecing, designed for law enforcement, so the could easier penatrate car doors. While I have never sectioned one of these bullets from a 45 ACP, I have sectioned the 357 metal piercing ammo loaded by Winchester. It is simply a soft lead core, very soft, that is encased in a pointed copper jacket. In fact even the nose section of the bullet is very thin. I doubt they would penatrate much more metal than standard FMJ's.