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In my experience you only need mag primers with certain hard to light powders like H110/WW296. Those are the only powders I've ever used them for. Standard primers for everything else. You do not need mag primers with any 2400 loads. I've loaded 2400 from too light to too hot and everything inbetween and never felt the need for mag primers with them.
They may be fine with 2400 loads but needed is another story. 2400 is not hard to light.
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