I have been looing at this for awhile myself. I like the idea of having one pistol for my bugout system that can fire mulitple calibers depending on what type of ammo I require, or what type of ammo Im able to find. It thus far seems to be a really nice gun. Ive looked into doing this for my Sig P226 before this gun came out, and because of the laws and the way the parts are made on that gun, its basically like buying a different gun and nove very economical. This seems to be a great solution. Im just waiting to get my hands on one to fire first.
I like the accuracy, capacity, and ammo compatibility of a 9mm, but I don't go below .45 with a self defense weapon. A few years back, a cop in our town shot a guy at almost arm's reach with his Beretta 92 three times and the guy was still standing.
I can't say I don't go below 45acp. It is my preferred round for a sidearm. I've carried and shot 9mm (9x19mm, 9mm parabellum), 40S&W, 45acp and 380acp in sidearms and the first two in full auto MP5 for work. I've shot all the rounds I've listed and so many others. As a few of you know I even have an AR15 pistol in 5.56 NATO. Each of the rounds mentioned have their good points. The 9mm Parabellum is by far the most used military round on Earth. Even more so then the 45acp. When the US Military switched from the 1911 to the Beretta they saw to that. The conflicts between then and now have made sure of it. (Links from Wikipedia, I don't n ormally use WIKI as a reference but the numbers matched up with 'Feet Per Second' Velocity numbers that I am aware of)
Depending on the brand of 9mm you're looking at a velocity of 990 to 1350 FPS, 45acp is at 845 to 1150 FPS, the 380acp is in between 990 and 1000 FPS and the 40S&W shows between 950 and 1350 FPS. I am unaware if these numbers include +P loads or not. I would guess they do not.
When you look at the rounds in question and which to carry you have got to think of many things; weight of bullets, mag capacity, availability of ammo and performance. ANY ONE OF THESE ROUNDS WILL KILL. That being said in my 22 year career as a police officer I've seen people walk away from being shot in the head from each of these rounds. On each occasion old, crappy ammo and glancing blows were the reasons. On each occasion except the 45acp the person being shot fell to the ground. With the case of the 45acp the person shot was knocked to the ground and that was a lucy shot from a thug at over 50 yards. There is a great difference between falling to the ground and being knocked to the ground. It has a lot to do with the perception of the person being shot. A lot of the average person's perception on being shot comes from Hollywood and video games. In Hollywood when someone gets shot in the head they tend to die. When people in movies get shot they tend to die. This is not so in real life. In real life we are talking about less then a half ounce of lead and steel hitting a target of an average of 165 lbs +/- (human male). Many times that target is moving toward the shooter. Yes the 1/2 ounce of lead and steel can do extreme damage depending on the type round it is but even at 1350 feet per second a 1/2 ounce slug striking soft tissue moving i... tends to strike soft flesh and continues to travel in a straight line until it hits something solid or loses momentum because of the mass of the target. At times the solid obect is the wall behind the target. (We all know that mass differs between targets). Glancing blows are a whole different story that I'm not about to try to explain. (I don't think my laptop is fast enough and I know I'm not ;-D). The mass of the slug isteslf makes a major difference too. The 40S&W is near the mass of the 45acp and has the velocity and performance numbers of the 9mm. it hasn't been proven near as much as the big and little brother but math doesn't lie. The numbers were enough to get many police departments to switch from the 9mm and the 45acp to the 40S&W from the 1980s to today. Many departments had issues with with smaller officers (male and female) being intimidated by the 45acp. The bosses at the department wanted a bigger round like a 45acp. The 10mm tended to be a bit hotter then the 45acp and even more intimidating. The 40S&W was a round they were willing to go with . Many didn't trust the 9mm for whatever their reasons.
SO! Are our eyes blurry?