I had an issue with Retumbo that I thought was weird. I had some loaded ammo that worked well in hot Florida temps. About a year later I shot the same ammo in Tennessee, a little bit cooler and it was an over pressure. I had to come down 4 grains to get a working load. The powder was out of the same 8 lb jug. I felt like the powder had gotten hotter over the time between loading sessions?????