Is 9mm same as 380 acp?

Discussion in 'P-3AT' started by johnmiltonmiller, Jun 10, 2009.

  1. johnmiltonmiller

    johnmiltonmiller New Member

    2
    Jun 7, 2009
    My friend gave me 20 re-load rounds of ammo.The cases stated 9mm on the shellplate and not 380.I called him and asked if he had trimmed 9mm luger cases? He said no that they were 9mm shorts.They are the exact same shells as my 380 ACP shells in terms of dimensions. They fit and shoot fine.
    Are 380 acp shells and 9mm shorts the same shells? That is my question.I do know that there are two different types of 9mm shells. I suppose that if they are stamped 9mm they are correct and if stamped 9mm luger they are wrong for my p3at and about 1/4" too long.----------Someone in the know I hope responds to this inquiry.---Johnny
     
  2. burley

    burley Active Member

    Nov 26, 2006
    Kansas
    Yep, 9 mm short and .380 ACP /.380 Auto are the same.
    The 9mm Luger/9mm Parabellum is not the same as the .380 ( in more than just length) ;)

    http://www.reloadbench.com/cartridges/p380acp.html
     

  3. pointpro

    pointpro New Member

    90
    May 9, 2005
    Yes 380 is also know as a 9mm short. With that said I've personally never seen it but then I've never looked either
     
  4. p3atnewb

    p3atnewb New Member

    75
    May 25, 2009

    there are more than 2 types of 9mm, i can think of a few off the top of my head... 9x17 (.380), 9x18 makarov, 9x19 luger(aka. parabellum, NATO, couple of other synonyms), 9x21, then there's the fact that .38 special and .357 are also 9mm in diameter, as well as their friends the .357 sig and .357 max.

    this link may be of some help to you.
     
  5. billjohnso20

    billjohnso20 Active Member

    Dec 7, 2008

    there are more than 2 types of 9mm, i can think of a few off the top of my head...  9x17 (.380), 9x18 makarov, 9x19 luger(aka. parabellum, NATO, couple of other synonyms), 9x21, then there's the fact that .38 special and .357 are also 9mm in diameter, as well as their friends the .357 sig and .357 max.

    this link may be of some help to you.  [/quote]
    Actually, 38 Specials, .357 Magnums, and .357 Maximum are .357-.358 whereas 9mm are .355-.356. One cannot safely use 38 caliber bullets in any 9mm Luger or .380 ACP firearm. Doing so will cause premature wear of the bore in the barrel and cause extreme spikes in SAAMI pressures. Only the 357 Sig is a 9mm or .355-.356 bullet. The 357 Sig is a necked down 40S&W case from .401 to .355.
     
  6. kt4me

    kt4me New Member

    76
    Feb 9, 2006
    People have noted in the past that for example the Walther PPK/S model manufactured in Germany will be marked 9mm Kurz (tranlating to 9mm short) and the same weapon manufactured in the US is marked .380 ACP. I knew of a person once who owned one of each and was surprised to realize they were actually the same gun (albiet the German worth quite a bit more).
     
  7. rcmodel

    rcmodel New Member

    Feb 6, 2005
    Eastern Kansas
    Sure you can.
    A .001" or .002" oversize bullet will not cause any harm if you work up the load for them.

    The proper lead bullet dia for a 9mm/.380 is .356".
    A .357" lead bullet, if it will chamber, will not increase pressure or wear out the barrel.

    BTW: I'd bet money if you slug a P3AT barrel and measure it, it will be closer to .357" then .355" anyway.

    Other names for the .380 ACP:
    .380 Auto
    9mm Browning
    9mm Corto
    9mm Court
    9mm Kratak
    9mm Kurz
    9mm Scurt
    9mm Short
    9x17mm

    Other names for the 9 mm Parabellum:
    9mm Luger
    9mm NATO
    9x19mm
    9x19 mm
    9x19mm NATO
    9 mm Para
    9mm
    Nine (I'se gonna cap yo azz wid my Nine)

    rc
     
  8. billjohnso20

    billjohnso20 Active Member

    Dec 7, 2008
    Sure you can.
    A .001" or .002" oversize bullet will not cause any harm if you work up the load for them.

    The proper lead bullet dia for a 9mm/.380 is .356".
    A .357" lead bullet, if it will chamber, will not increase pressure or wear out the barrel.

    BTW: I'd bet money if you slug a P3AT barrel and measure it, it will be closer to .357" then .355" anyway.

    Other names for the .380 ACP:
    .380 Auto
    9mm Browning
    9mm Corto
    9mm Court
    9mm Kratak
    9mm Kurz
    9mm Scurt
    9mm Short
    9x17mm

    rc
    [/quote]
    I'll take your word for it, RC. Everything I've read and been told by the mentors who got me into reloading have stressed never use jacketed 38 caliber bullets in a 9mm application. I've never checked on lead bullets though like you mentioned.
     
  9. jnn7404

    jnn7404 New Member

    16
    Jun 10, 2009
    I guess you learn something new everyday. I never knew that.