I bought some APP/JSG a couple weeks ago. First trip to the range with new powder fresh out of the factory sealed container produced very good groups. Second trip a few days later (and with higher humidity) did terrible. I decidedlast nightto get some of it out totry in one ofmy shotguns today, and had a lump of powder in the container - it had set up like concrete! It broke up with shaking the container, and I'm going to try it in a shotgun. If it lights OK I'll use it up harassing doves & squirrels.