I have been investigating various pistols for self-defense/concealed carry purposes. From time to time I see threads on the merits of one caliber vs. another. For example, I have seen snide (g) comments about .380 (e.g. "great for shooting mice" or "what are you going to do with it, THROW it at your attacker?"). I wonder, however, if OTHER factors besides caliber will affect stopping power. Specifically, am I correct that different types of ammunition, though designed for the same gun, can/will have different speeds? If I remember my physics correctly, force=mass times the square of acceleration. Therefore, is it...