Ok, today I took out my .22 Colt Woodsman pistol and four milk jugs filled with water. I never really intended to make the .25 ACP into something that it is not. What I wanted to do was compare it to a .22 lr pistol, which I have heard so many say is superior to the .25 ACP. The .22 passed through two of the jugs and stopped halfway into the third. The round I used was a 36 grain Remington Golden Bullet HP. While some might say that a hotter .22 would offer greater penetration, again I was only using the standard 50 grain FMJ .25 as well. Here is the revovered .22 slug, note that it mushroomed nicely.
