Also, my simple test of shooting pigs in the head from very close range caused the 9mm Gold Dot to ricochet, while the 45/200 XTP produced deep penetration and a major wound. After seeing that with my own two eyes, I could care less how many sectional density numbers are put up, I know which one of those two is more likely to penetrate a skull.
All pistol bullets can and will fail to penetrate skulls when impacting on anything other than a 90 degree angle. Ironically- 45 Auto as much as any of them. While you may have had that one time experience, a one off occurrence is meaningless. It happens often, even with 45 Auto.
