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For those of you casting your own bullets, try this sometime to create your own armor piercing rounds with a simple solution: Tungsten Carbide tire studs. I suggested this years ago to a friend who was into reloading, and he tried it at it worked. He was reloading .45 ACP slugs and inserting one of these aluminum jacketed tire studs into hollow points. Without looking into it too far, I'm guessing he used somewhere between a #12 and a #16 tire stud. Once completed, it will drive a .45 ACP hollow point through a 1/4" to 1/2" thick piece of steel plate; depending on the size of stud you use and the load you use. The length of the carbide rod inside the aluminum jacketed sheath is the length of the stud or in layman's terms, 12 to 16/32 long. They make them even longer for big truck tires, but they aren't pictured in this chart. The thing you need to remember is, you cannot alter the weight of the round much or it won't work to your expectations. The tungsten carbide rod itself is around 1/8" thick, but it is incased in the aluminum sheath which is about 1/4" in diameter. I'm wondering how well this would work with high powered rifle rounds?Tungsten Carbide is the hardest steel you can find on the planet, which makes it the perfect addition for Armor Piercing bullets.