Mag Primers OK???

partisan

August 07, 2009 13:32

Is it OK to use small pistol magnum primers for .38 spl and .40 S&W rounds?

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  Rocky Raab

  August 07, 2009 14:38

  That takes a two-part answer.
  
  Performance-wise, reduce your usual load by 5% and test with the new primers. Work back to your original load's velocity, if required.
  
  Gun-wise, magnum primers are sometimes harder to ignite - so your gun might not fire them at all if the firing pin strike is light for any reason.
  
  If they fire and you carefully work back to no higher than the usual velocity, you should be fine.

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  bpost

  August 07, 2009 16:05

  I would also tend to shy away from the super fast powders like Bullseye. A recent article I read gave me additional caution for substituting mag primers with fast powders. A full case of medium to slow powder did not seem to be an issue.

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  partisan

  August 07, 2009 18:54

  Thanks for the very informative answers!

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