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Magnum Rifle Primers

tazzer
what do you load with them ?
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8 comments

Date Votes
  • tazzer
    I just loaded some ammo for my garand and see that I used magnum rifle primers. They are winchester primers. My load was 50gr of BLC-2 with 150gr bullets. Are these going to be too hot? Am I going to bend the op rod.


    dgac
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  • Rocky Raab
    Some reloading manuals (Speer is one) specify magnum primers anytime a spherical (ball) powder is used. That's their in-house testing rule, but it isn't always necessary. My own in-house rules are:

    Use a magnum primer with powder charges over 60 grains.

    Use a magnum primer if the load will be shot in below-zero weather.

    Use (test) a magnum primer if you suspect that you are not getting proper powder ignition for whatever reason.


    If all you have are magnum primers, use them. But work up the load from Start with them and be aware that you may not get a close match between "book" charges and velocities and yours. Use book velocity as the guide for reaching maximum charge, as well as all other indications.
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  • tazzer
    can they be used in place of large rifle primers ??
    Im just wanting to know all I can learn snice IM just getting into reloading
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  • bpost
    quote:Originally posted by tazzer
    can they be used in place of large rifle primers ??
    Im just wanting to know all I can learn snice IM just getting into reloading


    In a nut shell yes. It is best to back the powder charges down a bit, .3 grains is enough. The Magnum primer is more energetic to help ignite large powder charges. Using them with ball powders also helps with consistent ignition.

    One bit of trivia; benchrest shooters, even using the small cases like the 6BR, holding about 30 grains of powder, use the magnum primer to reduce the SD and ES of the load.
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  • tazzer
    the reason Im asking is Im working on a deal that includes 1000 of them and wanted make sure I can use them I have a 30-06 and 7mm mag. that I will be reloading for.
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  • Rocky Raab
    VERY basically, then: Magnum primers are the same physical size as standard-force primers, but have more power. That does NOT always mean they make for more bullet speed. Changing nothing but the primer, a given load might be faster, slower or just the same. Ditto for the pressure the load develops.

    All this is explained more fully in your loading manual. Read all about it there.
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  • tazzer
    quote:Originally posted by Rocky Raab
    VERY basically, then: Magnum primers are the same physical size as standard-force primers, but have more power. That does NOT always mean they make for more bullet speed. Changing nothing but the primer, a given load might be faster, slower or just the same. Ditto for the pressure the load develops.

    All this is explained more fully in your loading manual. Read all about it there.

    I have read about it just not in to much sncie i have large rifle primers and did not need anything else I could sell the mag. ones but fig. Id use them if I could. Im at work and dont have the manual with me so I thought ID ask here while I was working out the deal [:D]
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  • hk-91
    My dealer runs magnum primers in everything he reloads for. from what i've been told its fine to do just dont run max charges. For large rifle i plan on reloading for 30-06 and 300 win mag and was told mag primers would work well for both.
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