9mm +P, +P+ and NATO

TNT said:
what is the difference of power with the +P+ rounds then?
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First, the .357 Sig has a defined pressure limit. Been a while since I looked but it's not as hot as a full house .357 mag. revolver round which can get to 600 plus ft. lbs.

+P+ is like the old days wildcat round. Most manufactures are putting their own limits on +P+. So, it's normally safe for modern large frame guns. I think +P+ can get very close to .357 Sig pressures.

But they are different rounds.

-A .357 Sig is a .40 necked down to 9mm.

-A +P+ 9mm is just a normal size 9mm with a hot load.

.357 sig is the +P+ or am I wrong in that assumption?
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.357 Sig is not +P+...it's just what it says, a .357 Sig. Just like there is no +P+ for .40 S&W.
 
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I'm not familiar with +P or +P+ loads, but I am with standard pressure and NATO specs. I regularly train with standard Magtech 124gr, and what we are issued at work is Fiocchi 115gr NATO spec ammo. Shoot one or the other in the same 92FS pistol and you can certainly feel the Fiocchi is hotter.
 
Not sure about felt recoil, but this is from the back of a Winchester Ranger 9mm 124gr FMJ NATO box:

"These cartridges are loaded to military velocity and pressure which is higher than industry standard pressure for 9mm Luger cartridges; average pressure is 10% higher than industry standard pressure for 9mm Luger."
 
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