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.243 Neck Inside Diameter

Discussion in 'Handloading and Reloading' started by WNTFW, May 31, 2010.

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  1. WNTFW

    WNTFW Member

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    Can anyone tell me what they have for a decapping pin / expander diameter or the neck I. D. for their .243?

    I have a set of .243 Winchester dies that I got used.

    The decapping pin / expander measures .237" and the neck I.D. ends up .236".

    My first clue they might be too small is the Lee trimmer pilot measures .239" and would not fit into the .236" neck.

    I figure neck I.D. should be bullet diameter minus .002, .003" or .004". .007" less than bullet diamter seems excessive.
     
    Last edited: May 31, 2010
  2. JimKirk

    JimKirk Member

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    .003 to .004 is plenty to hold most bullets in most guns. .003 is the nominal amount, I think.

    Jimmy K
     
  3. Blackrock

    Blackrock Member

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    My LEE die leaves the case mouth at .240 when I am done.
     
  4. 243winxb

    243winxb Member

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    I have 3 - expander diameters .2415" .2413" .2421" RCBS & Redding. For rifle .002" under bullet diameter is plenty in a rifle. For handguns .003 " or more under bullet diameter, sometimes more for the hot magnums.
     
  5. WNTFW

    WNTFW Member

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    Thanks for the replies.

    Hopefully a new expander will fix the problem.
     
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