Velocity and displacement of energy
Im under the impression many of our LEO are getting away from the 9mm and going to the 40&45 because of the velocity of the round. I shoot a person 12ft away with my 9mm going upwards ofm1200ft/sec, I risk the bullet going through that person and hitting the person behind them.(not hitting bone). The same goes for shooting through walls etc. the bigger slower rounds are safer and more lethal to the intended individual. The Law wants rounds that hit a target and stay in that target not rounds that go through or shoot shrapnel out the other side, possibly injuring others. But at the time, the 9mm was the cartridge of choice over the lousy .38's that just pissed people off. I have also,read many articles relating to the shockwave effect that takes place in the human body when hit by one of these rounds. A round with 975 ftlbs enters andnsimcemthe majority of your body is water, a shockwave forms which actually can short circuit brain function for a short period of time. Just like you have seen shots in ballistic gel..the human body acts much the same way. Blood vessels can become damaged from it and there is even arguable,proof of these waves causing bleeds in the head when the subject was shot in the stomach. Where do you think all these ammo manufactures came up with these new names like , shockwave, hydrashock etc. because of these tests. Getting hit with that much force releases a tremendous amount of energy into a body that has to go somewhere. The .40 was supposed to minimize the shoot through but come with the bang of a 45. Many many LEA are going to the .40 for this very reason and cost as well. I claim to be no expert, I'm just repeating what I have been reading the past few nights.. It's something to think about. Energy is neither made or destroyed, so when it is released into a body, all that massive energy lets loose a firestorm, not just from the direct wound, but from the energy. Just something to think about. The FBI is using .40cal. Local units are switching to,.40cal. There has to be a really good reason. Just something more to noodle on.