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The subject was "match grade primers", not match grade "stuff".
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....and the question was not of their construction, but if standard primers were safe to use in cold weather and whether they would drastically change the performance of the OP's loads if he changed to standard primers.
IMHO, the answers are yes to the first and no to the second. While I would want to shoot a few rounds to make sure my zero was still the same(as I always do after changing a component), I doubt that any difference in accuracy at hunting ranges and targets would be significant.