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Concur with Sevens.
I have been using 2400 for over 40 years now and have never used magnum primers.
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2400 may or may not be the same now as then. When Elmer Keith was still alive, 22 grains of 2400 behind a 255 KT cast bullet would leave a significant amount of unburned powder on the ground in front of the shooter. As a result, many shooters back then used magnum primers in an attempt to get all the powder to burn. Elmer wrote about that, but his opinion was that standard primers were good enough anyway. But, inasmuch as I have not seen references to 2400 powder leaving so much unburned in recent history, they may have changed the formulation.
I remember putting an eight foot length of news print paper on the ground in front of my .44 magnum and shooting...There was so much unburned 2400, one would think, "There has to be something wrong." But, that is just how it was.