Question on Primers

Question on Primers

This is a discussion on Question on Primers within the Reloading forums, part of the Defensive Ammunition & Ballistics category; What's the difference between magnum primers and standard primers? I'm going to be loading 9mm & 40S&W. Thanks...

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  • 2 Post By TX expat

Thread: Question on Primers

  1. #1
    New Member Array Big_D's Avatar
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    Feb 2012
    SW Missouri

    Question on Primers

    What's the difference between magnum primers and standard primers? I'm going to be loading 9mm & 40S&W. Thanks

  2. #2
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    Array TX expat's Avatar
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    Jul 2009
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    You'd use regular small pistol primers for those loads. You could use magnum primers but there is no benefit to doing so and you'll want to start at minimum and work your load back up.
    bmcgilvray and jem102 like this.
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  3. #3
    VIP Member Array OldVet's Avatar
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    Some powders get better ignition with magnum primers. Your reloading tables should show which loads were developed using them.
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  5. #4
    New Member Array Sparky508's Avatar
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    Graham Wa
    If magnum primers are what you can get a hold of right now, they'll be fine, but per TX expat said, you will want to start at the "bottom" and work back up. Magnum primers may cause pressure to increase vs standard primers, as they are "hotter", than standard.

  6. #5
    Senior Member Array FLSlim's Avatar
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    Mar 2011
    The difference--mag primers burn a little hotter. You certainly don't need mag primers for the 9 and 40 (now is the time for the read your manuals reminder), but they can be used. If you do, as already stated, work up those from the start loads.
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  7. #6
    Senior Member Array jem102's Avatar
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    Sep 2007
    East TN
    As stated already you don't need Mag. primers for the 2 rounds in question.
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