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jepp2 · October 21, 2012, 08:54 PM

If you use a magnum primer in a load that was developed with a non-magnum primer, it "could" develop higher pressure. So good practices would suggest you drop your starting load slightly to compensate.

The magnum primers were developed for the harder to ignite powders like H110.

A good reference can be found here.

October 21, 2012, 08:54 PM	#2
jepp2 Senior Member Join Date: December 24, 2008 Location: Loveland, CO Posts: 1,476	If you use a magnum primer in a load that was developed with a non-magnum primer, it "could" develop higher pressure. So good practices would suggest you drop your starting load slightly to compensate. The magnum primers were developed for the harder to ignite powders like H110. A good reference can be found here.