There is not a powder made that is 100 % temperature stable. All powders have inherent temperature sensitivity .. some more than others.
For myself, I use mag primers in all the Dble based powders that I use and all loads that contain 60+ grains of any powder . Any powder that will be fired at less than 5 deg C gets a mag primer as well.. Actually, I think all large rifle field loads using medium to large capacity cases with high load densities benefit from the use of Mag primers. I really haven't noticed a major difference with any high density hunting load that was developed with mag primers being much different when LR primers were substituted.. except in extreme temperatures. Target loads are another matter.
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When applied by competent people with the right intent, common sense goes a long way.
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