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Large rifle / large pistol magnum primers?

Discussion in 'Handloading and Reloading' started by Bullet, Dec 9, 2006.

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  1. Bullet

    Bullet Member

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    I have a 50 Beowulf that uses large pistol magnum primers. Are these as hard as large rifle primers? There is a question about this on another forum as to why the 50 Beowulf doesn’t use rifle primers to prevent slam fires. The 50 Beowulf is a low pressure round.
     
  2. EddieCoyle

    EddieCoyle Member

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    It is my understanding that large pistol magnum primers are hotter, not harder than regular large pistol primers; and that rifle primers are harder. Primer hardness varies somewhat brand-to-brand (try the search function I'm pretty sure this has been discussed here before).

    As for preventing slam fires, a large rifle primer in a large pistol primer pocket could have the opposite result - large rifle primers are taller than large pistol primers. They'll stick out of a 50 Beowulf case.
     
  3. Clark

    Clark Member

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    This page says that magnum primers have thicker cups and not harder cups:
    http://www.jamescalhoon.com/primers_and_pressure.php

    You can measure cup thickness.


    SAAMI specifications on primers and primer pockets per "Sinclair International's Precision Reloading & Shooting Handbook" 10th edition 1999

    ......................Depth min max diameter min max
    small rifle primer pocket .117 .123 .1730 .1745
    small pistol primer pocket .117 .123 .1730 .1745
    Large rifle primer pocket .125 .132 .2085 .2100
    Large pistol primer pocket .117 .123 .2085 .2100

    .......................Height min max Diameter min max
    Small rifle primers .115 .125 .1745 .1765
    small pistol primers .115 .125 .1745 .1765
    large rifle primers .123 .133 .2105 .2130
    large pistol primers .115 .125 .2100 .2120"
     
  4. Bullet

    Bullet Member

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    Does more cup thickness increase the amount of force required for a primer to be fired?
     
    Last edited: Dec 10, 2006
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