I had an opportunity to buy some old APP. ($100 for a case of 12-I wish I had bought a lot more) The powder in the bottles was a solid lump. The paper seals on the mouth were still intact.
I was determined to use it so I took a 1/8" brass rod, bent a triangle shape in one end, chucked the other end in a cordless drill and proceeded to stir the lump. It broke up nicely. I put a piece of nylon netting over the mouth of my Lee Auto Disc(gasp, it's plastic) and strain the remaining small pieces. I crush them up with my fingers. Shoots as good as fresh APP.
I use it in rifle, pistol and shotgun.