I would not be concerned with the stock mag as it will most likely work with a different bullet or OAL. So set it aside for further testing later when you have more experience.
Much too often way to much is made of the difference between a mag primer and a standard. I would only be concerned with the hot primer if I were working with max loads. Keep working up toward the max load .1 grain at a time while checking for high pressure signs and I think you FTE problems will go away.
Good luck and welcome to the hobby.
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