In the article by Horace Gore from the "Journal of the Texas Trophy Hunters", they were pushing the 75 A-Max at about 3700 fps out of a .22-6MM. At these high impact velocities, the bullet was penetrating a short distance and then blowing up. On a deer lung shot, this was delivering some very consistent "light out" kills. It sounds like, at lower speeds, it turns into more of a controlled expansion pill. This bullet, which I'm sure was never designed for anything but punching holes in paper, continues to impress me. . . . .