The problem is, if you pushed it, you would get to pay your lawyer to explain all that stuff in court while the prosecution showed pictures of holes in bulletproof vests.
The only practical application of AP that I ever saw was some of that exempted M2 in my friend the deputy's rifle. There was a tip of a large dope shipment coming in by boat. He was the "French roadblock*." That is, he was back up the road a ways with a rifle full of AP. If the dope runners blew past the deputies at the landing, he would rearrange their engine block with no further discussion. The shipment did not arrive on schedule so we don't know how that setup would have worked.
*Jan Stevenson described a French roadblock as a gendarme with a clipboard. If you didn't stop, there would be an automatic rifle or LMG a little way down the road.