As others have said, check for dust on the powder.
I recently got about 10-12lbs of various powders, some of which are very old, from an estate. I dumped each can into a bowl and only one had dust on it. That can went onto the lawn. The rest will get used.
I have about 2lbs of AL-5 I am still using. I loaded shotgun ammo from that can back in the mid-60's. It works fine in 380, 38sp and 9mm.
