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+P .40 S&W - Does this ammo exist?

Discussion in 'Handguns: Autoloaders' started by rock jock, Apr 15, 2003.

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  1. rock jock

    rock jock Member

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    I always thought that .40 S&W was loaded pretty much at its peak pressure in the standard load. Is there really any +P .40 S&W, or do the manufacturers simply bump the standard powder charge by 1% and then slap +P on it for marketing purposes?

    BTW. what is the standard pressure of .40 S&W?
     
  2. Zak Smith

    Zak Smith Moderator Emeritus

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    SAAMI max for .40SW is 35,000 PSI - same as for 9x19. There is no +P spec for .40SW.

    Note that there's lots of over-SAAMI-spec 9x19 shot: european (CIP) spec, or +P, +P+ without major problems, out of modern handguns. But we hear about .40SW blow ups all the time.

    My theory is that .40SW has a shorter max OAL relative to bullet length (which is a function of sectional density) added to the case length. This would mean relatively less initial combustion volume, with less margin. But that's just a guess.

    -z
     
  3. rock jock

    rock jock Member

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    Dang! How did I end up posting this in the wheelgun forum? :eek: Moderator, please forgive.
     
    Last edited: Apr 16, 2003
  4. Tropical Z

    Tropical Z Member

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    Centerfire Systems is currently advertising 170gr flat point +P .40S&W @ 1150 FPS which equates to 499 ft lbs of energy according to my scale.

    #43AM40+P3 @ $9.97 per 50
    1-800-950-1231
    Made in Hungary by MFS
     
  5. 22luvr

    22luvr Member

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    I think so..............

    Go to Georgia-arms.com and check out their "Shear Power Plus premium ammo. They have +P (or at least they call it that) in 155 gr JHP, 165 gr JHP and 180 gr JHP. My son and I tried some of this stuff in his H&K .40 cal USP compact. The stuff kicked like a mule and we had several jams, which is very rare with an H&K autoloader. I think it was the shape of the hollowpoint causing problems. Rather than put up with the possibility of a malfunction, I'd probably stick with a standard pressure .40 which is a pretty stout round just like it is.
     
  6. happy old sailor

    happy old sailor Member

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    interesting. i have always thought 40+p was called 10mm.
     
  7. Zak Smith

    Zak Smith Moderator Emeritus

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    SAAMI max for 10mm is 37500 PSI, 2500 PSI higher than .40SW. 9x19+P is 38500 PSI, however.

    10mm enjoys several advantages over .40SW besides the extra 2500 PSI:

    1. larger internal case volume decreases initial pressure
    2. larger internal case volume lets you stuff more, slower powder in there

    -z
     
  8. bountyhunter

    bountyhunter member

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    Look at Fiocchi

    Fiocchi sells some 170-gr FMJ ammo in .40SW that their website says has a muzzle velocity of 365 m/s (over 1200 feet/sec). It's not specified as +p (because their is no +p standard for .40). The muzzle energy is only about 10% below their lowest energy .357 magnum round offering, so it is plenty hot. I passed on Fiocchi as the .40 I shoot specs out at about 950 f/sec and it is already hot enough for my tastes.
     
  9. Justin

    Justin Moderator Staff Member

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    THE CHAIR IS AGAINST THE WALL
    *Punt*:D
     
  10. denfoote

    denfoote Member

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    That's what I thought too!!! :rolleyes:
     
  11. 106rr

    106rr Member

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    The ammo advertised (MFS) is made in Hungary. I doubt that the Magyar language has any word for +P. It may well be marketing hype. Early reports say that it is clean reliable and potent.
     
  12. jc2

    jc2 member

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    European ammunition is manufactured to CIP standards not SAAMI standards. CIP does not do "+P" thing, however the standards are roughly the same--CIP standards are not appreciably "hotter" despite many rumours to that effect.

    There is no SAAMI "+P" for the .40 S&W--it is just manufacturer's hype.
     
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