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Old March 12, 2009, 03:03 AM   #1
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Magnum Primers?

If I am reloading 300 Win mag, do I use standard or magnum primers? Thanks.
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Old March 12, 2009, 04:45 AM   #2
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Both will work, but I would be using magnum for obvious reasons

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Old March 12, 2009, 12:20 PM   #3
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If you are going to use ball powder or hunt in the cold I would use magnum primers. If you use stick powders and the temp doesn't get to low a standard will work.

The load data should tell you. If in doubt use the magnum primer and work up.
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Old March 13, 2009, 07:10 PM   #4
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Go with what the manual says for that powder.
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Old March 13, 2009, 07:22 PM   #5
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Either will work. But I would use the magnum. They are the same price. And as said before the outside temp matters.
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Old March 13, 2009, 08:05 PM   #6
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What James said is the key. Cold temperature extremes are an added reason, but the powder type is the main issue. Ball powders have smaller spaces between their grains and a flame front has more trouble moving between them to reach the grains more distant from the ignition flame. Among stick powders that is not an issue. However, very slow stick powders can have a lot of deterrent coating on them, and that, too, can be helped to ignite by the magnum primer.

The relationship between the choice of primer and a load's peak pressure are complicated, but you should always assume changing primer brand (magnum or not) will increase pressure until you prove otherwise. So work your loads back up from minimum or drop the charge you've been using 10% and work back up from there.
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Old March 13, 2009, 08:09 PM   #7
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i use mags on .270 and 7mm rem mag... so would for sure on 300... but I use a slow burning powder also
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magnum , primers

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