I agree that the primer specified for the data being used is what you should use generally. When given the choice, I will use the data provided by the powder manufacturer rather than from bullet manufacturers or other published sources such as magazine articles.

Contrary to what others have said about 2400 not needing magnum primers, both Alliant, and Hercules have recommended for years the Federal #200 Magnum primer. Only recently have they changed the recommendation to the CCI 500 for some reason. At the same time the maximun loads were reduced by from 3% to 5%!

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Gunsmithing since 1961