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100 GR RN in a 9mm?

Discussion in 'Handloading and Reloading' started by Josh45, Sep 30, 2011.

  1. Josh45

    Josh45 Well-Known Member

    So I have a small question....

    My brother recently bought some .380 bullets to shoot in his 9mm. He figured that since they both are .355-.356, There should be no real problem in using them as long as you stick to the manual of course.

    My only question is, Following the manuals information for a .380 bullet in a 9mm case should be O.K? He will be using start loads and making sure they chamber and such.

    There will be two 9mm that would be shooting these bullet.

    The first gun would be a S&W 6906 and the second gun would be a CZ-Phantom.

    Is there anything I am not noting here? I have the Lyman's 49th, Hornady's 8th and the Lee second edition. If I go by the data with Lee and the data on the Hornady's book, They both have similar OAL but the charges are quite different.

    So let use some quick notes.

    Bullet - 100 GR RN .380 These are Plated bullets. The loads will be starting.
    Shell - 9mm
    Gun 1 CZ Phantom
    Gun 2 - S&W 6906
    OAL difference in both books is 0.005
    Charges - Vary quite a bit...

    My only curiosity is if it is OK to use these bullets in these guns and Im kinda wondering If I would end up with a stuck bullet here...

    Any info or tips would be great!

    And yes, I did do a search and found some information but it was the other way around so I had to ask for myself...
  2. rfwobbly

    rfwobbly Well-Known Member

    Most all the better reloading manuals give data for 95 and 100gr bullets in 9mm. Follow that.
  3. Josh45

    Josh45 Well-Known Member

    So, Your saying to use a 9mm data for the .380 bullet? Making sure?
  4. rcmodel

    rcmodel Member in memoriam

    Yes, they should work in either 9mm pistol.

    No, a starting load probably will not cycle the slide.
    Yes, you can work the load up until it does.

    Hornady 100 grain JRN 9mm Luger data is safe and should function fine with plated bullets too, if you stop about midway between start & max loads.

    Just so you know, there is no difference between bullets for a .380 ACP and bullets for a 9mm Luger.
    They are both exactly the same size around, though .380 bullets are generally lighter then 9mm bullets..

  5. Josh45

    Josh45 Well-Known Member

    That's good to know :)

    I'm gonna use the 9mm data from the Hornady book then and go from there. Thanks gentleman, Appreciate it always.
  6. sixgunner455

    sixgunner455 Well-Known Member

    Right, it's not a .380(9mmKurz/Corto/Browning Short) vs 9mm Luger bullet issue. It's a 9mm/.355-.356 jacketed (or plated, if that's what you've got) round nose 100gr bullet. Put it in a 9mm Luger, .38 Super, or a 9mm Win Mag, or a .357 Sig, or a 9mm Largo, or whatever cartridge case that the .355 jacketed bullet is appropriate for diameter wise, and put an appropriate charge for that case and bullet combination behind it.

    Don't use .380 load data to load 9mm Luger cases. You probably won't get a harmonious result.
  7. Galil5.56

    Galil5.56 Well-Known Member

    These bullets have the potential to be a lot of fun for you... I loaded up some 100 grain .367" bullets (intended originally for my 9x18 Makarov) that I cast, water quenched, sized .358" and loaded in 9x19. Very easy to safely achieve 1300+ fps, and some of my loads I worked up registered 1450 fps+ from my 5" Beretta. Even with the extremely short OAL, function was perfect, and accuracy seemed OK with the limited number of rounds shot... Going to run them in .38 Special soon to see how they fly, driven to 900-1000 fps.

    Of course your particular plated bullets will likely have a factory suggested velocity limitation well below the numbers I achieved; it still will be no problem developing loads that can be around 1200 fps, and hopefully accuracy will be at least OK, function good, and POI will be close enough to POA.

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