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Compressed load and OAL and Pressure

Discussion in 'Handloading and Reloading' started by Afy, Jun 28, 2008.

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  1. Afy

    Afy Member

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    The Sierra Maunal lists 39.5 gr with a 120 gr SMK seated to a COAL of 2.785 inches as a copressed load.

    However if I seat to a COAL of 2.91 inches, it is no longer a compressed load. Will pressure go up or down?
     
  2. FieroCDSP

    FieroCDSP Member

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    Any time you increase the OAL on a given charge with the same bullet, your pressure will be lower. If you are using a different (longer) bullet, be careful, as you might seat too deep and spike the pressure.
     
  3. rcmodel

    rcmodel Member in memoriam

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    It will go down slightly, because of the increased case capacity with the long seated bullets.

    Compressing a charge has no effect on pressure one way or the other as long as it is a safe load to begin with.

    rcmodel
     
  4. Afy

    Afy Member

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    Ok then a follow on...

    the 120 GR SMK is 1.179 inches long.. seated at 2.910 COAL means there is only .297 inches actually in the neck/case... which is > caliber .260

    What effect would the BT design have on this? Or should I just stop worring and obessing and go shoot the damn rifle already?
     
  5. rcmodel

    rcmodel Member in memoriam

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    The only sure way to find out what you need to know, as far as load development, powder charge, seating depth, etc, is:

    Go shoot the Damn Rifle Already!

    You can stew & worry over all the minor details, and none of it does a bit of good until you start testing loads at the range!

    rcmodel
     
  6. Bullet

    Bullet Member

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    Last edited: Jun 28, 2008
  7. Afy

    Afy Member

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    Ok... tomorrow morning I am off to the range to go shoot...
     
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