FYI: I suggested to a friend in Idaho to take a #15 or #16 tire stud and press them into a hollow point .45 ACP round and use it for an AP round. It worked! Penetrated 1/2 inch steel plate. The inner rod is about 1/8 inch in diameter, but it is made out of the hardest steel money can buy, tungsten carbide.
Fairly cheap to buy in quantity from a tire tools wholesaler.
