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Magnum primers are made about 5% hotter than standard primers. So goes the theory to reduce loads 5% when using them. I always use magnum primers, large or small when working with compressed powder charges or otherwise heavier amounts of slow burning powder or when I know the mercury will be in the negatives. The extra charge in the magnum primer helps to insure complete ignition on heavier, slower charges of powder. This is why all larger "magnum" cartriges use the magnum primer, larger amounts of slower burning powder that need a little extra kick to light them off. Remember that they make magnum small rifle primers as well, and about the only "magnum" label there is the .222 magnum that is almost indistinguishable from the .223. Hope this helps.

[QUOTE="MisterE, post: 1217961, member: 24585"] Magnum primers are made about 5% hotter than standard primers. So goes the theory to reduce loads 5% when using them. I always use magnum primers, large or small when working with compressed powder charges or otherwise heavier amounts of slow burning powder or when I know the mercury will be in the negatives. The extra charge in the magnum primer helps to insure complete ignition on heavier, slower charges of powder. This is why all larger "magnum" cartriges use the magnum primer, larger amounts of slower burning powder that need a little extra kick to light them off. Remember that they make magnum small rifle primers as well, and about the only "magnum" label there is the .222 magnum that is almost indistinguishable from the .223. Hope this helps. [/QUOTE]

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