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This is a copy of a post that I did several weeks ago in response to a question about Power Ball ammo.
"I have done penetration tests and expansion tests on various 9mm ammo and the Power R Ball was the only one to expand 100% of the time.
Penetration tests was simply 4 Raleigh phonebooks stacked on top each other. The PrB never penetrated more than 1 and 1/2 books. 115 gr DPX would clog with paper and penetrate well into the 4th book, same for Golden Sabres, Hydra-Shock only did not penetrate as far. Gold Dot would expand about 50% of the time. When they did they would penetrate into the third book about 1/4 distance. When they didn't the fourth book took a licking.
Expansion tests utilized a one inch thick X 4 inch pine board duct taped to a gallon milk jug filled with water. Placed in front of a bullet trap tightly packed with old blankets and pillows that were being thrown away. All of the above mention loads expanded, most pretty impressive. Cover the pine board with a scrap of blue jean material and the only one to expand 100% of the time was the PrB.
Now I don't know the fancy math and all, but 100 gr traveling at a high fraction of the posted velocity of around 1400 fps impacting the breastbone of a BG in the area of the thoraic triangle is going to slow the threat down considerable, especially if it's diameter is increased 40 to 50%."
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