Arguement #1: The 40 S&W hits barely any harder than the 9mm and about the same with a good, modern 9mm load.
I don't buy into this. Not one bit. When I'm shooting my 9mm it's basically punching clean holes through whatever I'm using as a target. I switch over to my 40 and the difference is night and day. Depending on the target, I can clearly see the knock down power of the 40 over smaller rounds. Debris flying, pieces of the target(s) are flying around and the exit wounds created by a 40 are more intense. All in all, my guns chambered in 40 obliterate the same targets my 9mm punches relatively clean holes through.
Yes, you can get some real nice 9mm loads now days that shorten the gap between 9/40 but something that nobody mentions is the fact that these are specialty rounds and cost alot more. Who buys just strictly $1.25 a pop defensive rounds? This is such a moot point. You're going to be paying far more buying good 9mm loads than you would buying standard 40 FMJ. This is just to match the ballistics of the 40, not exceed them! In fact, the 40 still has the slight advantage vs even some of the best 9mm loads that you'll pay top dollar for.
I get it - you're going to be carrying the +P+ 9mm rounds, not plinking and ****ing around with them. Well, I like the fact that all my 40 rounds are potent. I can stockpile regular FMJ and feel good about it! With ammo prices going up and the future of our 2nd amendment rights in question, most people just cannot stockpile thousands, or even hundreds of defensive 9mm.
Argument #2: The 40 S&W is inaccurate and/or the recoil is just oh-so-bad and I cannot handle it!
I laugh every time somebody trys to say that somehow the 40 is not as accurate as [insert other caliber here]. Newsflash: It's either you or the weapon you're shooting - not the round. I will admit that it's a bit harder to learn because of the snappy recoil. The 45 is a push back recoil while the 40 is a snap which can bring you off target, I get it. The key to this is practice. It's not a perfect round and this is the proof - it's not the easiest cartridge to learn with. I think that it's also a disadvantage of the 45 ACP but yet that cartridge gets a pass because .. well.. "The 45 ACP has knock down power and is a real mans round!" ... At least, that seems to be most peoples thinking. In reality, they are both equally potent rounds, each with their own set of advantages/disadvantages.
Argument #3: Guns chambered for the 40 S&W don't last!
This basically comes from guns that are designed around the 9mm and then the manufacturer suddenly starts producing a version that will accept a 40 caliber bullet just as a quick cash out. Guns that are designed around the 40 such as the USP have not been proven to wear out quicker than say, the USP9. In fact, one would think that your 9mm will wear out just as quickly if you're shooting +P rounds.
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