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Magnum primers,

Discussion in 'Handloading and Reloading' started by dirtykid, Mar 21, 2013.

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  1. dirtykid

    dirtykid Member

    Joined:
    Nov 15, 2010
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    It has probably been covered before on here,
    But all I could find recently on a shelf was Magnum primers for my rifle,
    I had worked up a nice load for my .243 with 65gr Vmax/4895/CCI200 ,
    I wanted to try to stretch the konockdown with a 75gr pill,

    All that was available was CCI 250's so I started on the lower-end of the scale for the 75gr (range of 31.4 to 38gr max) at a comfortable 32gr of 4895

    Now I read in a few forums that the STARTING load should be about 10% BELOW the lowest load ?? :cuss:

    What say you of THR ?
    Does a Magnum primer really add that much initial pressure spike ?
     
  2. rcmodel

    rcmodel Member in memoriam

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    Totally wrong.

    The Starting load should never be reduced any further then the load data calls for.
    And that is usually a 10% reduction from the MAX load.

    Changing components like primers, cases, and to some extent bullets without running into unexpected pressure problems is why it is called a Starting load.

    rc
     
  3. NCsmitty

    NCsmitty Member

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    You will be fine using the starting loads listed, the problem may occur when using a maximum listed charge with standard primers, and then substituting magnum primers. I find backing off 5% of a previous load using standard primers is the sensible caution when substituting magnum primers.


    NCsmitty
     
  4. dirtykid

    dirtykid Member

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    Minne-soda
    Thanks Rc,

    Now when the temps get close to freezing, and we dont have wind gusts up to 30mph,
    I can comfortably place my melon inches away from the action without fear of
    a unexpected detonation in the chamber,
     
  5. dirtykid

    dirtykid Member

    Joined:
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    Minne-soda
    Thanks to both of you guys,

    I guess thats what I get for reading too much on the internet,
    too much mis-information often gets parroted among the various forums,
    and there often is not someone that will chime-in with the BS-flag ..
     
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