From my collection these cartridges came out a while ago for the 357 Mag & 38 Pistols and gained a pretty bad reputation on their ability to defeat kevlar vests, they were called Metal Piercing rounds made by Geco.
They were called "Cop Killers" the design of the round was that it flattened out like an broad arrow head and well just defeated the vest.
They were banned pretty quickly and to be honest I did not know they existed until my friend gave me one and explained what they were.
So I read up about them and sure enough there was discusions about them and what they did being removed from the market quicker than a slippery lizard in a mud hole.
Gunbroker had one for sale I spied in their Vintage Ammo for $30/USD!Information
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