Somehow, shooters got along for many decades using powders which were “temperature sensitive”. The introduction of “extreme” powders was a smart marketing ploy by Hodgdon for its lines of propellants (Hodgdon, IMR and WW). I’m not saying that such powders are not a good idea, but to eschew any other powders just because they don’t say “temperature insensitive” on the label is overly limiting, IMO anyway.
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