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40 S&W cases length.

Discussion in 'Handloading and Reloading' started by Hardatwork, Dec 5, 2007.

  1. Hardatwork

    Hardatwork Well-Known Member

    Cases for 40 S&W are according to the reloading manual should be 0.850 in length. When are they to short for reloading? I have some that are 0.839. Thank You
  2. rcmodel

    rcmodel Member in memoriam

    That .850" is MAX length.

    Hornady says "Trim too" length is .845"
    Speer says it is .840".

    Another .006" or .003" shorter isn't going to hurt a thing.
    Shoot them!

  3. Hardatwork

    Hardatwork Well-Known Member

    IF 0.840 is OK should I trim them to the same height so I will get the same crimp?
  4. Walkalong

    Walkalong Moderator

    It is not going to make any difference you will see on target. I have never trimmed any auto brass.
  5. rcmodel

    rcmodel Member in memoriam

    I assume you are taper crimping them in the standard seating die, or using a Lee FCD.
    Regardless, length will not matter on any straight-wall pistol caliber.

    Just sort them by brand, or length, or whatever, and load them.
    At most, you might have to give your seating/crimping die a slight tweak, but probably not.

    And I'm with Walkalong.
    I have never trimmed, or worried about case length, on any straight-walled auto pistol brass in 45+ years reloading them.

    For anything else from the .25 ACP through the .45 ACP, I've never trimmed or measured one in my life.

  6. Hardatwork

    Hardatwork Well-Known Member

    OK Thanks just wanted to Be safe.I have loaded these a few times and noticed that they were different lengths.Thanks for your help.

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