reloading 380 auto

Discussion in 'Reloading' started by texasjim, Oct 11, 2009.

  1. texasjim

    texasjim New Member

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    Sep 9, 2008
    sorry to keep kicking a sleeping dog guy's but I am still trying to find out if any of you have noticed the inside step i.e. neck reaming with federal american eagle brass the case neck thickness at the rim is about .010 and you can see a distinct step about 3/16 of an inch inside the case and the tickness goes to about .020 am I the only one who has run across this? thanks for listening and or reply's jim:texas:
     


  2. Cajun CB

    Cajun CB New Member

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    Sep 13, 2009
    Plano
    It is on several brands.

    I had to taper my expander to avoid mashing the brass to get around this.
     
  3. Texas1911

    Texas1911 TGT Addict

    May 29, 2017
    Austin, TX
    Most brass expands in thickness as you get towards the rim.

    .380 just happens to be a very short case, so you'll run into a problem with it sometimes.
     
  4. texasjim

    texasjim New Member

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    Sep 9, 2008
    380 brass

    texas1911 and cajun cb thanks for your reply I had just never run into this on any brass before was and may still reduce my expander plug tip a little to prevent said problem I have just been reloading them without flair and they seem to be ok with the bullets I'm using jim:bowdown:
     
  5. Texas1911

    Texas1911 TGT Addict

    May 29, 2017
    Austin, TX
    Cool deal.

    Any of those tiny case or necked pistol cartridges are a pain to deal with. Seating the bullets on a .223 or .204 is like threading a needle sometimes. I refuse to reload 5.7 FN as it has to be frustrating.
     
  6. medalguy

    medalguy Active Member

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    Sep 18, 2009
    New Mexico
    Wonder why 9mm doesn't have the step? Hardly any difference in the length of the brass. Same with 9mm Makarov brass.
     
  7. Wolfwood

    Wolfwood Self Appointed Board Chauvinist TGT Supporter

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    May 12, 2009
    luger isnt necked...
    im speaking out fo my ass, really casue i havent started reloading yet.
    so experts, how close am i?
     
  8. medalguy

    medalguy Active Member

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    Sep 18, 2009
    New Mexico
    Well .380 isn't necked either. It's basically just a shorter case than 9x19 by a few thousandths, but the same diameter.
     
  9. Texas1911

    Texas1911 TGT Addict

    May 29, 2017
    Austin, TX
    .380 is 2mm shorter, it's 9x17.

    9mm Makarov is 9x18, so it's 1mm shorter.

    Keep in mind that .380 is not designed by the same person. The 9x19 Luger is a German military cartridge designed for the Luger pistol. It was originally chambered in a necked chambering, but was upsized for wounding purposes.

    The .380 was designed off of the 9x19 by John M. Browning, and was designed for compact handguns.

    That may account for the change in the brass. The .380 could have been designed for a loosely supported chamber, whereas the 9x19 is fully supported in the Luger.
     
  10. Cajun CB

    Cajun CB New Member

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    Sep 13, 2009
    Plano
    380 Vs. 9 MM Case

    The 380 case is not the same diameter as the 9mm. The 380 is .373 while the 9mm is .380. The base of the 380 is .374 while the 9 is .394. A 9mm will not fit into a 380 shell holder.

    I don't no why that step is in SOME cases.
     

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