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It is appropriate to use a magnum primer with IMR4350 or slower stick powder I.E 4831, 7828 etc for reliable ignition, additionally I always use a mag primer with ball powder. Cold temps is another reason to use magnum primers with the above mentioned powders,
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I have not used a magnum primer w/ 4831, but with IMR7828 and H414, I get better (more consistant) performance, particularly in cold weather, when using magnum primers in loads for my .270WIN.