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9x18 mak case length

Discussion in 'Handloading and Reloading' started by area51, Mar 3, 2013.

  1. area51

    area51 Well-Known Member

    Converting some 9x19 brass to 9x18. Is there a min case length ? I see the max is .708. I rimmed a few using the rcbs trimmer and I cut a few to .700 :eek:
    I adjust the length and now they are comming in at about .703/.704
  2. gamestalker

    gamestalker member

    The rule of thumb for trim too length is .010" off maximum, or .698" for that 9x18., so your .700" number would be just fine. And .703" would as well work just fine. I usually trim rimless brass to about middle of the road, that's just me though.

  3. rcmodel

    rcmodel Member in memoriam

    Too short!

    Lyman #49 says:
    Max case length is .713".
    Trim length is .710".

    Hornady #6 says:
    Max case length is .713".
    Trim length is .708".

    Since the cartridge headspaces on the case mouth, and the extractor must snap over the rim during feeding in a MAK.
    I would decide which book is right, and use that minimum length.

    You may get misfires any shorter then that.

  4. cougar1717

    cougar1717 Well-Known Member

    Starline's tolerance is .700" - .706" for new brass. I've measured PPU and the steel cased Brown bear and Wolf - the ones I measured were in the .704" - .708" range.
  5. joneb

    joneb Well-Known Member

    I trim sized 9x19 to .708" this works well in my E.G. Makarov.
  6. GT1

    GT1 Well-Known Member

    18 millimeters(.708) seems about right.

  7. MI2600

    MI2600 Well-Known Member

    My new Starline were .702". I trimmed my 9X19 to that length figuring they probably knew more than I did.
  8. joneb

    joneb Well-Known Member

    That is likely a safe bet :)
  9. area51

    area51 Well-Known Member

    I'll aim for that as well...
  10. joneb

    joneb Well-Known Member

    I figure if .708" was to long I'd trim more but this length works in this pistol. Better to long than to short, sometimes you need to sneak up on things.
  11. ArchAngelCD

    ArchAngelCD Well-Known Member

    In that case just trim off 1mm and call it good. (I'm sorry, I just had to say that!)

    Hornady 9th Edition has the same data as Hornady #6
    Max Case Length - .713"
    Case Trim Length - .708"
  12. GLOOB

    GLOOB Well-Known Member

    Check your gun. My PA-63 chamber is cut long. It will barely catch the rim on a chambered round. The slide has to be dropped hard, or it'll just hang on the side of the rim. This doesn't matter, so long as the round fires. But in case of a malfunction, I wouldn't want to have any short cases.

    I use a Lee, so I can't go back and make the pilot longer, unfortunately. Well, I guess I could if I broke out the lock-tite. My cases come out right at 18mm. If your cases chamber (and extract, unfired) out of your gun, then there's no problem.

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