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M&P Blowing Up?

This is a discussion on M&P Blowing Up? within the Autoloaders forums, part of the Armory category; Originally Posted by John in ar I keep hearing and reading that all over the place, but not following at all. I'm not a .40 ...


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Old February 23rd, 2015, 02:34 PM   #31
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Originally Posted by John in ar View Post
I keep hearing and reading that all over the place, but not following at all. I'm not a .40 guy at all - don't even own one. But it seems like this "high pressure" issue is tossed around as a slam on the .40 pretty regularly in a lot of places.

Isn't SAAMI spec for .40S&W the same as standard 9mm, at 35,000PSI...? Which would make it even lower than the 9mm+P's 38,500PSI, for that matter...?
You are correct...the 40 & the 9 have the standard pressure. Now the following is simply my personal speculation, but I believe the .40SW has a faster pressure spike, which is seen in it's snappiness (recoil)... I use to be a "nothing-but-40-guy", but transitioned over to the 9mm two years ago. The newer bullet designs for the 9mm made the .40S&W moot, again, just my opinion...YMMV
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