Mass, in a very recent thread you and the original poster discussed how using a different size bullet for a pistol could change the point of impact. I am confused, not an expert by any means, and would like to understand this. How can a smaller size bullet change the point of impact by around 6" over 20 yards? Surely the difference in drop due to drag and gravity is miniscule over that short a distance. Assuming of course, that the pistol is aimed the same way each time. Help me out here, what am I missing?