OK, I know this is probably going to start a caliber war, but it really is a serious question... There are several new little 9mm pistols coming out with shorter barrels. The Kimber Solo, for instance, has a 2.7 inch barrel. Now, most 380's have less than 3 inch barrels, and the premium SD 380 loads should be made to work in that barrel length (several of them are chronograph'd at an honest 1000 fps out of those stubby barrels). But most 9mm's have barrels over 3 inches, and any bullet is going to lose velocity coming out of a shorter barrel. So, are we getting into a situation where a modern 380 hollow-point would expand better than a short barreled 9mm? And, yes, I know that a 9mm is always going to be more powerful than a 380. But a modern 380 that expands to .50 or .60 caliber could be more effective than a 9mm that doesn't expand at all. A 3 inch barrel seems to be the threshold where many 45 ACP bullets start to have trouble expanding. What is the threshold for 9mm's?