I recently purchased my first 1911 style handgun (Colt 1991A1 Commander). Last Sunday I put 150 rounds of Federal Champion thru it, with absolutely no problems. I was firing into a very large pile of snow. With the warm weather in N. central IL this week the snow has really melted. Because of this, I was able to recover 102 of the bullets today. I always thought that a FMJ was completely enclosed, and a jacketed bullet had an exposed base. Well, 101 were like the one on the right, and 1 was the one on the left. Have I been misinformed all these years?