When I'm done depriming/resizing

Discussion in 'The Ammo & Reloading Forum' started by WildcatFan, Feb 7, 2010.

  1. WildcatFan

    WildcatFan New Member

    Aug 1, 2009
    St. Louis
    ...do I need to measure the top of the brass to make sure its ok? My electronic calipers measure in milimeters and inches. What measurement am I looking for at the top of the brass?
  2. Alpo

    Alpo Well-Known Member

    Feb 3, 2007
    NW Florida
    The measurement at the top of your brass (I presume you mean the case mouth) would depend on what cartridge you are loading. 30 caliber should be about 305 or 306. 22 caliber should be about 221 or 222.

    But I see no need in measuring the case mouths. If your dies are made correctly, it is the right size. If they aren't, then you will have trouble with your loads, and the only fix is a good die.

  3. LDBennett

    LDBennett Well-Known Member

    Dec 20, 2003
    Hesperia, CA
    But...... you need to measure the overall length of the case. It must not exceed the dimension in the manuals. If it does then the brass case has to be trimmed to the trim-to length, typically 0.010 inches shorter than the maximum case over all length (max OAL). Trimming MUST be done after the cases are sized as the sizing dies push the brass all over the case and effect the OAL of the case.

    If you did not understand this then it is time to reread your reloading manual.

  4. 1911Man

    1911Man New Member

    Jan 23, 2010
    St. Louis
    Alpo - I'm loading .45ACP. Gotta range of measurement on what the case mouth should be?

    LDBennett - Yes, already aware of OAL.
  5. 1911Man

    1911Man New Member

    Jan 23, 2010
    St. Louis
    Looking at the manual now......please hold.
    Last edited: Feb 8, 2010
  6. 1911Man

    1911Man New Member

    Jan 23, 2010
    St. Louis
    Ah, found it. .4732" for the .45ACP. Movin' right along.......
  7. JLA

    JLA Well-Known Member

    Feb 26, 2007
    Heart Of Texas
    you are measuring casemouth diameter. Thats about right for a sized, belled and otherwise ready to load case. After loading, you should measure them right out of the crimp die. they should measure .470" at the casemouth with a .451" bullet. This measurement determines the proper amount of taper crimp...
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