Quoted: Sig 230;
I don't know that I will ever get rid of my .40's or my G31 with extra barrel, but I do agree that the .40 is not a round to be taken lightly. When the FBI was in the throes of all their S&W 10mm controversy, one of the reasons their firearms people wanted to stay with the 10mm "light" (180gr/980fps) rather than go to the .40 was the fact that the case/bullet combination of the 10mm allowed the same performance at lower chamber pressures. In addition, the "time/pressure spike" for the .40 goes almost straight up...that is, it develops peak pressure almost instantaneously...this is not typical of most handgun calibers.
This fact, when combined with poor maintenance, less than perfect reloads, and partially unsupported chambers, can be a problem waiting to happen. It is also why those manufacturers that initially tried simply opening up their 9mm platform to accommodate the .40, had failures. (Now you know why HK decided to build the USP in .40 first, then downsize it to the 9mm and why Sig went to the thicker, machined slide for the 229)
My personal choice is to use the .40 since I believe it offers some advantages over other rounds in certain applications, but I do so cautiously and only with factory ammunition. For general recreational use, there are better rounds.
Flame all you want, guys, but Sig 230 has a valid point.
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Thank you sir. If folk will take time to read what I posted, they will find that my concern is just as you state. Today there are a bunch of FIRST TIME handgunners and FIRST TIME reloaders. This group, through no fault of their own, is running the greatest risks.
The 40S&W IS different. Not better, not worse, Different. There are things with the 40S&W that can get people hurt, but that in any other caliber, would only be annoying or at worst, damaging to their gun.
My point is that those of us who might have more experience have a responsibility to help inform new users of the good, and bad points to each choice they may make.If you graph the pressure curves vs setback for 40S&W you get a classic
J curve. The pressure starts to rise and then goes almost straight up. Look at this setback table for the 180gn 40S&W from
Standard OAL for the .40S&W is 1.120" ... table data from "Handloading" by Charles E. Petty, American Handgunner Jan/Feb 1998, p41.
OL Pressure
1.140" 26,195 psi
1.130" 27,521 psi
1.120" 29,079 psi
1.115" 29,924 psi
1.100" 32,900 psi
1.075" 39,641 psi
1.050" 50,954 psi
1.040" 57,926 psi
1.030" 66,890 psi
1.020" 80,345 psi
1.010" 101,286 psi
1.000" 138,744 psi
An additional .025" (25/1000th of an inch) from a setback of 1.100" adds almost 10,00 psi of pressure. Go another .020 and pressure jumps over 18000 psi. That is already at about a 50% over pressure point. Beyond that the scale goes almost straight up.
Since I started posting about this I've had lots of people flame away. But that has nothing to do with the facts, they still stand. When everything goes right, the 40S&W can be a great round. But when
anything goes wrong, excessive set back, too tight or too loose crimps, fouling in the rifling, over charge, whatever, the margin of error in the 40S&W is simply too small.
That's JMHO and YMMV, but I feel we do owe it to new members of the shooting fraternity to help them make informed decisions and to give them as much information as possible to stay safe.