According to a balistician on this website good self defense ammo in all the auto calibers aside from 10 mm will deposit almost exactly the same energy in a target. With in 10% of each other. So as long as you have decent ammo it really is personal preference.
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Quoted: Considering the criteria you listed, it amazes me all the people who actually voted for the .45 which is the worst of the bunch for items 2-5
No personal defense ammo is cheaper than a 9mm No semi-auto of equal size and weight can hold more rounds than the 9mm No ammo of any type other than .22LR is easier to find than 9mm No personal defense ammo is easier to shoot well (for wives or anybody else) than the 9mm.
If the right ammo is used and the shot is well placed, a 9mm will stop a person just as easily as a .40 or .45. If shot placement is poor, a .40 or .45 is just as ineffective as a .22LR. Don't fall for all of the bigger is better BS.
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#2 Cost is subjective. What is your life worth? #3 8 rounds of 45 with good shot placement is 8 kills (with 7 round mags, 9 with 8 round mags), where as the Miami shoot out showed that more than 2 rouns of 9mm were required to stop the bad gun, so that is only 7.5 bad guys for 15 founds, 8 if you top of w/16 in a 15 round gun.
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#2 he didn't ask "value of ammo". If he had then maybe you would have an argument about it being subjective. He asked "cost of ammo". There is no argument about whether the 9mm is the least expensive #3 15-17 rounds of good JHP 9mm with good shot placement is 15-17 kills. It is a fallacy to believe that a BG can't be taken out with one 9mm round.
But let's assume for a minute you are right, it takes two shots of 9mm for every one shot of a .45. How many of us here will ever go up against 8 BG's? If someone did, the chances of you being able to get a clean shot off on all 8 of them is slim to none. You'd be better off trying to use suppressing fire at them to either keep them at bay or to get the hell out of there. Either way 15-17 rounds of anything will be more useful than 7-8 rounds of anything else.
How does one achieve proper shot placement? Practice, practice, practice! You can say all you want about "what is your life worth" but in the real world, most of us have a limited budgets that we have no choice but to consider. Most people can not afford to practice with .45 ammo anywhere near as much as they can with 9mm.
I have no problem with you guys who prefer the .45 for whatever your reasons are. What you guys need to keep in mind is, just because it may be the right choice for you, that doesn't mean that it is the right choice for everybody else. Given Nate's criteria, it seems clear to me that the 9mm is the right choice for him.
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WTF OVER?
Ok first of all I think you need to get some practice shooting in a stressed environment. You think you're going to shoot 15 bad guys, all in the head or cns with a 9mm when your hands shake so bad you could mix paint between the shelf and the register? If you have 15 people on your ass standing your ground is not an option.
Suppressing fire? This isnt rambo. You are accountable for every round that leaves your barrel. You CANNOT fire indiscrimanently in the general direction. When you shoot billy, his grandma and thier dog instead of handing some crack head your wallet what do you think the judge will say when your explanation is "suppressing fire"?
Just carrying more rounds in a pistol does not qualify it as better. You only need 2-5. In 99% of defensive shootings no more than 3 rounds are fired. In 99% of gun fights no more than 6 rounds are exchanged. What good do those extra 9 rounds do you in your mag if you wont use them?
.45 is too expensive? You cant afford $2 more a box? WTF! I realize people are on a budget but its $2! Thats bullshit. You do need to practice with the same ammo you carry but you dont need to do that exclusivly. Surplus .45 is available at very low prices.
Now all that being said, I voted for 9mm being that its potent enough to do what you need to do and cheap which met your criteria. I personally carry .45 because I like the round, I like the gun and it meets my criteria. I would carry a 9mm, I have before. I dont have one to carry at the moment anyway. I just bought a .40 and we'll see if I like carrying that one. Id feel no less protected with any of them. I'm going to have to check out 10mm here in the future to see what I can do with it and if its a viable option for me. When I compete I plan on using .357 sig +p just for the flat trajectory. If what ever pistol I have in .357 sig doesnt group like I want it I'll use my 1911 that I carry since I can shoot the president off a dime with it.