difference between .40cal and 10mm?

Discussion in 'The Ammo Can' started by tinctorus, Oct 10, 2008.

  1. tinctorus

    tinctorus XDTalk 1K Member

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    anyone know the difference between the 2 rounds? .40cal and 10mm
    whats the difference in them because visually they look fairly identical but maybe side by side in my hand i could tell more of a difference
     
  2. Cannibul

    Cannibul XDTalk 5K Member Founding Member

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  3. MordeKyle

    MordeKyle XDTalk 1K Member

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  4. Joeywhat

    Joeywhat XDTalk 5K Member

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    Think of the 10mm as a .40 S&W magnum...except the 10mm came first.

    From my understanding you can reload both cartridges with the same dies, they use similar bullets, and are the same diameter.

    There's at least once revolver chambered in both 10mm and .40.
     
  5. MordeKyle

    MordeKyle XDTalk 1K Member

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    ricbs dies are marked 10mm/40s&w
     
  6. Reno82

    Reno82 XDTalk 2K Member

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    I've shot 40 S&W out of my 10mm just to test it.. worked fine. One shot only.
     
  7. Joeywhat

    Joeywhat XDTalk 5K Member

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    FYI I don't suggest anyone goes and tries to shoot a .40 out of a 10mm gun...it won't chamber correctly and you'll either push the cartridge too far up in the chamber (probably not bad, shouldn't even fire), or it won't headspace in the chamber and WILL fire, but the case will not be securely in the chamber.

    SO DON'T DO IT!
     
  8. tinctorus

    tinctorus XDTalk 1K Member

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  9. Gunzzi

    Gunzzi XDTalk 1K Member Founding Member

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    Hmmm, I thought they were virtually the same. Good information to know.
     
  10. AZXD

    AZXD XDTalk 35K Member

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    All correct, with one exception ... The .40 is a wussified 10mm :p
     
  11. fredj338

    fredj338 XDTalk 10K Member

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    Yep, think 38sp vs 357mag. The only diff. is the case length AND the 10mm uses a large pistol, the 40S&W a small.
     
  12. mcb

    mcb XDTalk 2K Member

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    To lay it out completely

    10mm uses large pistol primers
    40S&W uses small pistol primers

    10mm has a SAAMI maximum pressure of 37,500psi
    40S&W has a SAAMI maximum pressure of 35,000psi

    Both fire a 0.400inch diameter bullets (0.401inch cast bullets)
    10mm has a typical bullet weight range of 135gr to 220gr
    40S&W has a typical bullet weight range of 135gr to 180gr

    Case dimension are very similar with the 10mm being 0.142 inches longer. Specifics below in dimensioned drawing.

    [​IMG]

    [​IMG]

    10mm has mystical powers :p
    40S&W is shorter and weaker :p

    There was a very short lived 10mm Auto Magnum (more info PDF file) but as far as I know only one gun from AMT was every chamber for it. Its case was a lengthened 10mm Auto case that was 1.255 inches long. It was substantially more gun than the 40S&W or 10mm Auto.

    mcb
     
  13. seminoles

    seminoles XDTalk Newbie

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    The differences between the 40cal. and the 10mm is this the 40cal. is 1.135" and the 10mm is 1.260" also the case length differ as much by 0.142 inches approximately 1/7th of an inch. The thickest part of the 10mm case web is 0.4252 inches or 0.03mm more than the 40cal. 0.4241 inches. I dont know if this helps any but I thought I would add my two cents. I have several different sizes and calibers from a 380auto, 9mm for my wife and a 357sig, 40cal, 10mm and a 45 all except one is a sa xd. I like shooting them all bc Iam a handgun shooting competitor but the 10mm wares me out a little and the ammunition is a little pricy so is the 357sig but I order mine direct I dont go through a store bc Iam also a riffle long range shooting competitor so I need quite a bit of amo. I was reloading but that got expensive and time comsuming bc of all the different sizes and loads anyways if u can shoot both and see which one you like best and feel comfortable with and can group the best which ever that one is buy it..
     
  14. fredj338

    fredj338 XDTalk 10K Member

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    The same, no, sim, yes. Much like the 38sp & 357mag, the 10mm is a longer caed version with identical bullets. HOWEVER, the cases are NOT hte same. The 10mm takes a LP, the 40 a SP. The 10mm brass also has a thicker case head. They load the same, can use the same dies as noted. The 10mm is the 40 magnum.
     
  15. Mudinyeri

    Mudinyeri XDTalk 2K Member

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    Sort of like the difference between .357 SIG and .357 Magnum. Sure, the bullets are the same diameter, but the similarities pretty much stop there.

    For your reference:

    [​IMG]
     

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