9mm the same as .357 magnum?

9mm the same as .357 magnum?

This is a discussion on 9mm the same as .357 magnum? within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; I was wondering why people always say that 9mm +p is equal to the .357 magnum? in the same bullet weights? I'm not one to ...

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  1. #1
    Senior Member Array 1911luver's Avatar
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    9mm the same as .357 magnum?

    I was wondering why people always say that 9mm +p is equal to the .357 magnum? in the same bullet weights? I'm not one to bash 9mm(its a good round,i have a few pistols chambered in it) but I don't see it being the same as a .357 magnum as far as terminal balistics goes. So what do guys think is a Glock 26/19 with +p 9mm more effective than say my Ruger SP101 with a 125gr bullet?

    I would think looking at the data and it seems like even in a +p+ loading the 9mm still doesn't have the same muzzle energy as even a "lite" .357 magnum load. So what do you guys think of this?


  2. #2
    AEA
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    I would say 9mm +P is CLOSE to .357 Mag, but not quite there.

    I would also say that 9mm +P+ is even closer.

    Both of these statements are from actual shooting of all 3 rounds and the felt recoil and muzzle flash. I do not have access to a crono.

  3. #3
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    WARNING: I you should open the links in a new window (right click - open link in new window) ...


    Well... here's Hornady's claims...

    9mm 124gr TAP
    https://www.hornady.com/shop/?page=b...duct_sku=90248

    Velocity (fps) / Energy (ft-lbs)
    Muzzle 50 yd 100 yd
    1110/339 1030/292 971/259

    .357 Mag 125gr JHP/XTP
    https://www.hornady.com/shop/?page=b...duct_sku=90502

    Velocity (fps) / Energy (ft-lbs)
    Muzzle 50 yd 100 yd
    1500/624 1314/479 1166/377

    The problem with their information is that these numbers are based on a 4" barrel for the 9mm and an 8" barrel for the .357 - so it's not a fair comparison IMO.
    "Wise people learn when they can; fools learn when they must." - The Duke of Wellington

  4. #4
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    In chronographing both over the years I don't see it. Whether factory fodder or hand load the .357 Magnum wins, published ballistics aside. The .357 SIG or the old .38 Super appear to be everything the 9mm is cracked up to be but isn't.

  5. #5
    VIP Member Array farronwolf's Avatar
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    The closest thing in common that a 9mm and .357 mag have is the diameter of the piece of lead. Beyond that I think you have to grasp at straws to make comparisons.

    For instance, Hodgdon has a load listed in their data book of a 125 gr Hornady XTP lead with Win 296 powder, or Hodgdon 110, and a velocity of 1996 fps, and an energy level of 1105 ft lbs for the .357 mag.

    This would more than likely blow apart any 9mm on the market. Even the hottest Buffalo Bore +p+ loads at 115 gr only come in at 500 ft lbs.

    I can't figure out why anyone would try to make a comparison between the two. Maybe a .38 special and 9mm but not the .357 mag.
    Just remember that shot placement is much more important with what you carry than how big a bang you get with each trigger pull.
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  6. #6
    Member Array forestranger's Avatar
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    From what chronographing I've done w/9mm & 357, with full house 357s, even out of 2 1/2" or 3" barrel, the 357 wins signifcantly. When you go to "mid range" 357s like 125 Golden Saber, the 124+p 9mm (like Gold Dot) is about the same velocity. 1100 to 1200fps depending on barrel lengths.

  7. #7
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    No Comparison.

  8. #8
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    .357 Sig and .357 Mag are closer than 9mm / .357 Mag

    Matt
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  9. #9
    jfl
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    A 9 mm can beat a .357 ...

    If the 9mm is fired from a 15" barrel (my UZI ) and the .357 is fired from a 2" barrel revolver with a large cylinder gap.

    Now, from similar guns, the .357 is one order of magnitude above the 9mm, everytime !!!
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  10. #10
    VIP Member Array edr9x23super's Avatar
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    The 9mm doesn't get there when it comes to comparisons with a .357 mag; thats why for years the 9mm could never be used in IPSC competition and guys like Robbie Leatham and Jerry Barnhart began using .38 supers in the open disvision. IPSC used to have the power factor much higher than it is now, at 175 so there was no way 9mms could compete. My old racegun load was 13.5 grains of AA7 over a 115 grain FMJ; the velocity chronoed out around 1600fps, which made the comp work real well, rendering the gun almost recoilless.

    During the mid to late '80s, Colt had an autopistol called the all-american 2000 which failed miserably, but was an interesting experiment. They basically took a .38 super cartridge, beefed it up and made it rimless. The velocities were well into .357 magnum territory and the gun was intended to be marketed to police departments looking to trade in their .357 revolvers for the autopistols, which gave them the same ballistics as their revolver with 15 round autopistol firepower.

    As cool as it sounds, the pistol was plagued with problems (someone intimate with this can chime right in here) and the gun was eventually discontinued, never making any inroads to the police markets which were soon overrun with SIGs and eventually dominated with the Glocks.

    I myself saw the tremendous potential in an autopistol round that could deliver .357 mag ballistics, and when I finally retired my racegun I had an STI built in .38 super and had the extractor tuned to handle rimless rounds. So I carry 9x23 125 grain silvertips in that gun, which leave the muzzle around 1550fps.....

    Pretty spiffy considering that gun holds 18 rounds in the mag and one in the pipe. Imagine having a .357 with 19 rounds?
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  11. #11
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    The Coonan Arms .357MAG Semi~Auto ~ A NICE vintage semi-auto with true .357 power because it eats .357 Magnum ammo.
    I wish that I would have purchased one way back when.
    Vintage ones are priced way out of my league these days and "Rare" spare magazines are selling for $250.00 each.

  12. #12
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    Quote Originally Posted by QKShooter View Post


    The Coonan Arms .357MAG Semi~Auto ~ A NICE vintage semi-auto with true .357 power because it eats .357 Magnum ammo.
    I wish that I would have purchased one way back when.
    Vintage ones are priced way out of my league these days and "Rare" spare magazines are selling for $250.00 each.
    All I can say, between gobs of saliva dripping fro my chin is "Oh My"
    Disclaimer: The posts made by this member are only the members opinion, not a reflection on anyone else, nor the group, and should not be cause for anyone to get their undergarments wedged in an uncomfortable position.

  13. #13
    Member Array chenemf's Avatar
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    Quote Originally Posted by farronwolf View Post
    The closest thing in common that a 9mm and .357 mag have is the diameter of the piece of lead.
    Empahsis on close. The 9mm is .356

  14. #14
    Member Array johnsonabq's Avatar
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    I was wondering why people always say that 9mm +p is equal to the .357 magnum?


    Then .45acp is better than .357mag!
    Jeff
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  15. #15
    VIP Member Array AZ Husker's Avatar
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    Probably the closest you'll come in a common gun is the .357 Sig out of something like a Glock 31. Double Tap ammo's stats are a 125gr Gold Dot at 1450fps and 584 ft/lb. My chrony consistently reads them at just over 1500fps. Nice setup when you can buy a drop-in 9mm barrel for practice!
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