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That same volume of powder should have the same energy as it did yesterday, regardless of temp/ humidity..........Can someone please make me understand?
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No, no one can make you understand. However since the energy per unit volume has changed with the temperature and humidity to keep the same total energy as previously, the volume must change. Why would you assume that the total energy of the load used in the previous session was the more accurate loading ? The actual total energy released is based upon a vast array of variables. Temperature and humidity are but two. I figure the force used to accuate the reloading press handle is more of a variable than the temperature and humidity variances.
Don't sweat the small stuff. Start low and work up. I avoid maximum loads.