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Author Topic: Magnum Rifle Primer Considerations  (Read 2566 times)

Outbreak

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Magnum Rifle Primer Considerations
« on: November 15, 2012, 05:56:53 pm »
So I ordered 10k small rifle primers and when they got here I noticed they're magnum primers. Do I need to alter my .223 Rem loads in order to use the magnums? In general, what effect will they have on rifle loads?
TexasOutbreak

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    JesseL

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    Re: Magnum Rifle Primer Considerations
    « Reply #1 on: November 15, 2012, 07:14:06 pm »
    To be safe I'd work up from starting loads again.

    It's my understanding that they're generally intended for use with ball powders which tend to be a little harder to ignite. They're definitely going to make for some slightly higher initial pressures compared with non-magnum primers.
    Arizona

    Outbreak

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    Re: Magnum Rifle Primer Considerations
    « Reply #2 on: November 15, 2012, 08:34:06 pm »
    At starting load levels it shouldn't be an issue in an AR, though?
    TexasOutbreak

    I take my coffee black...like my rifles.

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    I'm glad that your chains rest lightly upon you. --JesseL

    JesseL

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    Re: Magnum Rifle Primer Considerations
    « Reply #3 on: November 15, 2012, 08:43:07 pm »
    I really wouldn't think so...

    What powder are you using?
    Arizona

    scarville

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    Re: Magnum Rifle Primer Considerations
    « Reply #4 on: November 15, 2012, 08:51:37 pm »
    In handgun loads the general rule I learned was to reduce any established load by 5% and work up when switching to magnum primers. In bottle-necked cartridges the figure I recall was 10%.  As a rule, starting loads are about 10% below max loads (unless you use a weird powder like H100) so start loads from the book should be fine.

    YMMV, IANAL and free advice is worth what you paid for it.
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    Outbreak

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    Re: Magnum Rifle Primer Considerations
    « Reply #5 on: November 15, 2012, 08:59:40 pm »
    Using AA2015. Never used the powder before but it was cheap and available in 8lb jugs.
    TexasOutbreak

    I take my coffee black...like my rifles.

    I absolutely despise Glocks. That's why I only own two.

    I'm glad that your chains rest lightly upon you. --JesseL

    JesseL

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    Re: Magnum Rifle Primer Considerations
    « Reply #6 on: November 15, 2012, 09:24:55 pm »
    Ball powder but at the fast end of the spectrum. Definitely start at min and work up.
    Arizona

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    Re: Magnum Rifle Primer Considerations
    « Reply #7 on: November 16, 2012, 09:25:02 am »
    I believe that a number of 5.56 loads call for a magnum primer.  What manual are you using?  Lately I've been using Hogdon's & Alliant's web sites for load development and not only are they up to date but they have a lot of different projectiles to choose from, but other than that I use the Speer #14 manual.
    North CarolinaMedically retired Air Force (17 years, 7 months & 25 days)

    Outbreak

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    Re: Magnum Rifle Primer Considerations
    « Reply #8 on: November 16, 2012, 12:36:39 pm »
    I've been using the same sources as you.
    TexasOutbreak

    I take my coffee black...like my rifles.

    I absolutely despise Glocks. That's why I only own two.

    I'm glad that your chains rest lightly upon you. --JesseL

    THE NORSEMAN

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    Re: Magnum Rifle Primer Considerations
    « Reply #9 on: November 17, 2012, 02:41:11 am »
    Jesse hit it square with reply #6.   :)   Magnum's are a bit better choice with this powder if you're going to be doing any shooting in cold weather anyway.  And winter is coming on.
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