Inconsistant Case length

Discussion in 'Ammunition & Reloading' started by Tenderribbs, Mar 9, 2013.

  1. Tenderribbs

    Tenderribbs New Member

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    When I'm trimming my cases some will need it and some are well short of needing trimmed. When your setting your bullet the OAL is going to be affected by these inconsistent case lengths meaning if I want the same exact length on all the rounds I have to reset the bullet setter die every time right? Or am I doing something wrong ? Thanks
     
  2. locutus

    locutus Well-Known Member Supporter

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    Leave the seating stem alone and COAL will be the same.
    Case length does not effect COAL.
     

  3. tri70

    tri70 New Member

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    I had some 223 that will vary in COL with Hornady seating die if I did I not trim to length on the brass. I was loading 55 gr Nosler Combined Tech bullets.
     
  4. Tenderribbs

    Tenderribbs New Member

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    Ok why then am I getting different COAL almost every time ?
     
  5. locutus

    locutus Well-Known Member Supporter

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    Your bullets will vary in length. Measure them. If you're really anal about seating depth, you need a comparator ** to measure depth. Actual COAL can vary with the same seating depth..

    Case length will not effect COAL. There has to be another factor in play.

    If it bothers you, trim them all to the length of the shortest case. That's unnecessary, but it makes some folks happy.

    ** www.sinclairintl.com

    Click on reloadiong tools and measuring equipment.
     
  6. Tenderribbs

    Tenderribbs New Member

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    Something else I did was to load using the same station on my progressive press that seemed to help keep them closer to COAL .
     
  7. racer_x

    racer_x New Member

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    Am I thinking wrong?
    It will effect how far the bullet is seated in the case witch in turn will effect preasure, granted mayb not enough to notice
     
  8. locutus

    locutus Well-Known Member Supporter

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    No. The bullet will not be seated as deeply in the shorter case.


    As long as CAOL is constant, the powder capacity of the case is unchanged.
     
  9. racer_x

    racer_x New Member

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    Thx locutus, thats what I was thinking.
     
  10. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

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    The difference between max length and trim length is .010". I trim everything to trim length. COAL has little to do with case length. Bullet profile will cause soem variance. Not every bullet is EXACTLY the same. Slight variantions in ogive will cause slight COAL variations.
     
  11. locutus

    locutus Well-Known Member Supporter

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    Absolutely. And that is why I always set my seating stem by measurements with a bullet comparator. (I use Sinclair's comparator)

    Keep good records, and make dummy cartridges for different bullets and precise adjustment of your seating die is a 30-45 second operation.:)